Infants In Neonatal Intensive Care Unit Research Articles

UK and US risk factors for hearing loss in neonatal intensive care unit infants.

Early detection and intervention of hearing loss may mitigate negative effects on children's development. Children who were admitted to the neonatal intensive care unit (NICU) as babies are particularly susceptible to hearing loss and risk factors are vital for surveillance. This single-centre retrospective cohort study included data from 142 inborn infants who had been admitted to the NICU in a tertiary regional referral centre. Data were recorded for 71 infants with confirmed permanent congenital hearing loss hearing loss. To determine impact of NICU admission independently of prematurity, babies were individually matched with 71 inborn infants on gestational age, birthweight, and sex. Neonatal indicators were recorded for all children with permanent congenital hearing loss. Presence of UK and US risk factors for hearing loss were collected on the neonatal population with hearing loss and for the matched controls. A fifth (21%) of babies with hearing loss had one or more UK risk factors whereas most (86%) had at least one US risk factor. False positives would be evident if US factors were used whereas the matched controls had no UK risk factors. Ten babies who at birth had no UK or US risk factors did not have any significant neonatal indicators identified in their records, one was ventilated for one day and two had a genetic anomaly. Current risk factors for hearing loss we identified for follow-up in this high-risk group are highly specific for congenital hearing loss. UK risk factors were highly specific for hearing loss but not sensitive and conversely, US risk factors are sensitive but not specific so false positives would be recorded. A national study of neonatal indicators could provide the utility to test which combinations of risk factors provide high sensitivity without losing specificity.

Tongue-tie in the Neonatal Intensive Care Unit Compared to Healthy Newborns.

We sought to characterize the prevalence of ankyloglossia in our neonatal intensive care unit (NICU) population and to determine characteristics of this cohort compared to infants in the birth center (BC). Prospective data were collected using a standardized flow sheet. Breastfeeding infants undergoing evaluation for tongue-tie in the BC and NICU were included. Coryllos type, tip to frenulum length, tongue function, frequency of frenotomy, and breastfeeding outcomes were compared. Of 20,879 infants birthed at or admitted to the institution during the study period, there were fewer patients diagnosed with ankyloglossia in the BC compared to the NICU (3.3% BC vs. 5.4% NICU, p < 0.01). Of these, 163 underwent frenotomy: 86 in the BC and 77 in the NICU. For those undergoing frenotomy, gestational age (39.1 ± 1.3 BC, 34.4 ± 4.4 NICU, p < 0.01) and age at time of procedure (3.2 days BC, 29.2 NICU, p < 0.01) were the only demographic factors significantly different between the groups. There was no difference in Coryllos type or function score. In a subset of NICU infants with multiple assessments over time, function scores after frenotomy were significantly improved compared to pre-frenotomy (p < 0.01). Standard assessment tools appear to be appropriate for use in infants in the NICU, despite the higher rates of prematurity, low birth weights, and increased comorbidities. Assessment and intervention for tongue-tie can be one critical intervention to move these patients closer to oral feeding and discharge to home. Level 3 Laryngoscope, 2024.

Neuroimaging-Guided Music Interventions for Infants in NICU

This Viewpoint discusses the use of neuroimaging to tailor music-based protocols among infants in the neonatal intensive care unit (NICU).

Accuracy of Electronic Health Record Documentation of Parental Presence: A Data Validation and Quality Improvement Analysis.

Parental presence in the neonatal intensive care unit (NICU) is known to improve the health outcomes of an admitted infant. The use of the electronic health record (EHR) to analyze associations between parental presence and sociodemographic factors could provide important insights to families at greatest risk for limited presence during their infant's NICU stay, but there is little evidence about the accuracy of nonvital clinical measures such as parental presence in these datasets. A data validation study was conducted comparing the percentage agreement of an observational log of parental presence to the EHR documentation. Overall, high accuracy values were found when combining two methods of documentation. Additional stratification using a more specific measure, each chart's complete accuracy, instead of overall accuracy, revealed that night shift documentation was more accurate than day shift documentation (76.3% accurate during night shifts, 55.2% accurate during day shifts) and that flowsheet (FS) recordings were more accurate than the free-text plan of care (POC) notes (82.4% accurate for FS, 75.1% accurate for POC notes). This research provides a preliminary look at the accuracy of EHR documentation of nonclinical factors and can serve as a methodological roadmap for other researchers who intend to use EHR data.

Family-Centered Care for LGBTQ+ Parents of Infants in the Neonatal Intensive Care Unit: An Integrative Review.

Having an infant in the Neonatal Intensive Care Unit (NICU) can disrupt parent well-being, the transition to parenthood, and the typical trajectories of infant and child health. For lesbian, gay, bisexual, transgender, queer, or other sexual and gender minority identity (LGBTQ+) parents, this stress may be compounded by health disparities and fear of stigma and discrimination; however, research is lacking about LGBTQ+ parents of infants in the NICU. The purpose of this integrative review was to better understand the experiences of LGBTQ+ parents of NICU infants, with a focus on experiences of stigma and discrimination, sources of strength and resilience, and provision of family-centered care. We searched EBSCOHost, ProQuest, Web of Science, and Google Scholar between 30 May 2023 and 18 September 2023 for empirical studies published in English in peer-reviewed scholarly journals in which LGBTQ+ parents shared their experiences with having infants admitted to the NICU. We identified six articles that met inclusion criteria, all of which were qualitative studies that included 12-14 LGBTQ+ parents of NICU infants. LGBTQ+ parents in all studies reported instances of perceived stigma and discrimination while their infants were in the NICU, whereas parents in two studies mentioned strength and resilience, and parents in three studies described elements of family-centered care. There is a need for rigorous research on family-centered NICU care that includes questions about sources of strength and resilience in addition to challenges. We propose that future researchers use community engaged methods to center perspectives of LGBTQ+ parents.

Exploring early life social and executive function development in infants and risk for autism: a prospective cohort study protocol of NICU graduates and infants at risk for cerebral palsy

BackgroundDelays in early social and executive function are predictive of later developmental delays and eventual neurodevelopmental diagnoses. There is limited research examining such markers in the first year of life. High-risk infant groups commonly present with a range of neurodevelopmental challenges, including social and executive function delays, and show higher rates of autism diagnoses later in life. For example, it has been estimated that up to 30% of infants diagnosed with cerebral palsy (CP) will go on to be diagnosed with autism later in life.MethodsThis article presents a protocol of a prospective longitudinal study. The primary aim of this study is to identify early life markers of delay in social and executive function in high-risk infants at the earliest point in time, and to explore how these markers may relate to the increased risk for social and executive delay, and risk of autism, later in life. High-risk infants will include Neonatal Intensive Care Unit (NICU) graduates, who are most commonly admitted for premature birth and/or cardiovascular problems. In addition, we will include infants with, or at risk for, CP. This prospective study will recruit 100 high-risk infants at the age of 3–12 months old and will track social and executive function across the first 2 years of their life, when infants are 3–7, 8–12, 18 and 24 months old. A multi-modal approach will be adopted by tracking the early development of social and executive function using behavioural, neurobiological, and caregiver-reported everyday functioning markers. Data will be analysed to assess the relationship between the early markers, measured from as early as 3–7 months of age, and the social and executive function as well as the autism outcomes measured at 24 months.DiscussionThis study has the potential to promote the earliest detection and intervention opportunities for social and executive function difficulties as well as risk for autism in NICU graduates and/or infants with, or at risk for, CP. The findings of this study will also expand our understanding of the early emergence of autism across a wider range of at-risk groups.

Pilot Testing Transcreated Spanish-Language Study Materials for Symptom Research With Infants and Parents in the Neonatal Intensive Care Unit.

Rising admission rates of Hispanic/Latinx families to the neonatal intensive care unit (NICU) have increased the number of non-English-speaking individuals who may wish to participate in research studies. However, a lack of appropriately translated research study materials may limit the opportunity for these families to be involved in research that could impact the care that infants and families receive in the NICU. The primary purpose was to pilot test study materials that were transcreated from English to Spanish with the assistance of a bilingual community advisory board with Spanish-speaking parents of NICU infants. A total of 19 Spanish-speaking parents (15 mothers and 4 fathers) who were representative of the population of interest completed paper-and-pencil surveys, along with a cognitive interview. Preliminary data related to decision-making and goals of care, infant symptoms, and their experiences in the NICU were also collected. The internal reliability of the transcreated study instruments ranged from good to excellent (α= 0.82-0.99). Participants reported that study materials were not offensive and did not make them feel uncomfortable; however, they found some words/phrases to be confusing. Parents had the opportunity to provide suggested wording changes. Language barriers and a lack of cultural responsiveness can affect the care that infants and their families receive. More accurate and culturally appropriate transcreation of study materials can remove barriers to research participation and facilitate better communication with non-English-speaking families, which may lead to the development of better-informed evidence-based interventions and clinical practices in the NICU.

Mortality Risk in US Neonatal Intensive Care Unit Infants by Birth Size Classifications Comparing Three Growth Curves

Introduction: Three widely referenced growth curves classify infant birth anthropometric measurements as small (SGA), appropriate (AGA), or large (LGA) for gestational age (GA) differently. We assessed how these differences in assignment affect the identification and prediction of neonatal intensive care unit (NICU) mortality risk in US preterm infants. Methods: Birth data of infants admitted to NICUs from the Pediatrix Clinical Data Warehouse (2013–2018) were analyzed. Birth weight, length, and head circumference of 46,724 singleton infants (24–32 weeks GA) were classified as SGA, AGA, or LGA using the Olsen, Fenton, and INTERGROWTH-21st curves. NICU mortality risk based on birth size classification was analyzed using unadjusted and adjusted logistic regression stratified by GA. Results: Odds of mortality were increased with SGA classification at all GAs, size measurements, and curve sets, compared with AGA infants. LGA classification for weight was associated with lower mortality risk at 24 weeks GA and higher risk at 30 weeks GA. Odds of mortality did not differ significantly across curve sets. Classification of size at birth alone had relatively low predictive ability to identify mortality risk, with unadjusted AUCs near 0.5 for all analyses. Conclusion: There were no significant differences across curve sets in predicting mortality. Classification of size at birth is a relatively imprecise method to identify infants at risk for NICU mortality.

Paternal Role Adaptation in Premature Infants in NICU: A Descriptive Qualitative Study

Aims and objectives: This study aimed to explore the adaptation experiences of first-time fathers of preterm infants after experiencing the trauma of preterm birth. Background: Becoming a father is a significant life event that can bring about profound changes in a man's identity and lifestyle. However, there is currently a lack of research on the adaptation experiences of fathers of preterm infants.Design: A descriptive qualitative study was conducted. Methods: Thirteen fathers of preterm infants were recruited from June 2022 to April 2023 at Chongqing Children's Hospital in China. Participants were all first-time parents, and their infants had received treatment in neonatal intensive care units. Deep semi-structured interviews, guided by a questionnaire, were conducted to collect data. Inductive content analysis was used to analyze the data. Reporting followed COREQ guidelines. Results: The data analysis generated 28 themes, including 9 subordinate themes and 3 superordinate themes. The superordinate themes were "Role preparation", "Post-traumatic adjustment", and "Growth adaptation". Conclusion:Fathers of premature infants in the Neonatal Intensive Care Unit (NICU) face unique challenges during their child's hospitalization and in the initial three months following discharge. The father's ability to navigate these challenges and embrace the complex aspects of fatherhood signifies his adaptation to the role. Relevance to clinical practice: Healthcare providers should assess the role adaptability of fathers of preterm infants and provide timely and effective interventions to support parental emotional well-being and parenting behavior.

Effects of increased physical therapy staffing in the neonatal intensive care unit on oral feeding maturation and neurodevelopment of extremely low birth weight infants

BackgroundIt remains a matter of debate as to what extent early intervention may facilitate long-term functional outcomes of preterm infants in the neonatal intensive care unit (NICU). We aimed to examine the effect of increasing physical therapy (PT) staff dedicated to the NICU on temporal changes (initiation, duration) of PT interventions and functional outcomes (acquisition of full oral feeding and Hammersmith Neonatal Neurological Examination). MethodsExtremely low birth weight infants, retrospectively collected from an academic medical center, were allocated to two subgroups, either a baseline period (N = 48) without NICU-dedicated PT staff (non-dedicated group) or a quality improvement period (N = 42) with additional dedicated staff (dedicated group). ResultsCompared to those in the non-dedicated group, NICU infants in the dedicated group started PT earlier and had increased PT treatment for additional 14 min per day when achieving full oral feeding. The infants in the dedicated group significantly achieved full oral feeding earlier than the non-dedicated group. As for Hammersmith Neonatal Neurological Examination, there were significant differences in two items (total and tone) between the groups. ConclusionsAdditional NICU-dedicated PT staff facilitated earlier intervention and increased PT treatment in terms of daily duration. Moreover, the dedication shortened the completion of full oral feeding and improved neurological development, presumably resulting in better developmental outcome.

Parental stress, depression, anxiety and participation in care in neonatal intensive care unit: a cross-sectional study in Italy comparing mothers versus fathers

BackgroundThis study aimed at documenting the levels of stress, depression, anxiety and participation in care among mothers versus fathers of newborns hospitalised in a third-level neonatal intensive care unit (NICU)...

Variability in Practice and Implementation of Oxygen Target Saturation Policies in United States' Neonatal Intensive Care Units.

This study aimed to describe target oxygen saturation (SpO2) ranges used for premature infants in United States' neonatal intensive care units (NICUs) and to describe if these target SpO2 ranges have changed in recent years. A 29-question survey focused on target SpO2 practices and policies was distributed via the NICU medical directors listservs for the American Academy of Pediatrics Section of Neonatal-Perinatal Medicine and Pediatrix Medical Group between August and October of 2021. Results were collected via Research Electronic Data Capture (REDCap). We received responses representing 170 unique, levels 2, 3, and 4 NICUs from 36 states. Most NICUs (130, 78%) have recently changed their SpO2 targets in response to target SpO2 clinical trials. Over time, the most commonly reported target SpO2 range has shifted from 88-92% to 90-95%. Of NICUs that changed limits, the most common lower SpO2 limits increased from 88 to 90% and the upper SpO2 limits changed from 92 to 95%. The interquartile range for lower SpO2 limit shifted from 85-88% to 88-90% and the IQR for upper SpO2 limit decreased from 92-95% to 94-95%. Most NICUs had designated conditions that would allow for deviations from standard target SpO2 ranges. These most commonly include pulmonary hypertension (152, 95%), severe bronchopulmonary dysplasia (81, 51%), and retinopathy of prematurity (51, 32%). Oxygen saturation limits have changed over time with an overall increase in targeted SpO2. However, there remains considerable interunit variation in SpO2 policies. There is a need to achieve consensus to optimize clinical outcomes. · What are the SpO2 ranges in United States' NICUs?. · There is a shift in SpO2 ranges for preterm infants in NICUs across United States.. · Variability still persists in SpO2 ranges for preterm infants in United States' NICUs..

Impact of Parent Presence and Engagement on Stress in NICU Infants.

Infants in neonatal intensive care units (NICUs) are exposed to frequent stressors that impact their neurodevelopmental outcomes. Parent presence and engagement are considered critical to improving infant outcomes, yet associations between cumulative NICU parent presence, engagement, and infant stress are infrequently examined. To examine associations between NICU infant stress and the amount (hours per week) or frequency (days per week) of parent presence and skin-to-skin care (SSC). A secondary analysis of a data set representing 78 NICU families was conducted. Infant acuity was measured using Neonatal Medical Index (NMI) scores. Parent presence and SSC data were collected from electronic medical records. Infant stress was measured using resting salivary cortisol levels collected at NICU discharge (median = 33 days of life). More cumulative SSC was associated with lower discharge cortisol in NICU infants for SSC measured in hours per week (P = .03) or days per week (P = .05). Cumulative parent presence was not significantly associated with infant cortisol at discharge. Hierarchical regression analyses examining timing of parent presence supported a model including admission cortisol, NMI score, and parent presence during weeks 1 to 4 of life for explaining infant stress at discharge (R2 = 0.44, P = .004). Analyses examining timing of SSC supported a model including admission cortisol, NMI score, and frequency of SSC during week 1 for explaining infant stress at discharge (R2 = 0.21, P = .04). Early, frequent SSC to mitigate stress in NICU infants was supported. Results suggested that timing of parent presence impacts NICU infant stress; however, additional study is recommended.

The Impact of Video Calling Between Preterm Infants and Their Mothers on the Physiological Parameters of Infants and Mother-Infant Bonding.

This study aimed to determine the effect of video calling between preterm infants treated in the neonatal intensive care unit (NICU) and their mothers on the physiological parameters of infants and mother-infant bonding. Preterm infants need prolonged treatment in the NICU, and their families may have difficulty seeing their babies during this treatment process. This is a prospective, randomized-controlled, experimental study. The study sample consisted of 75 preterm infants and their mothers. The data were collected using a maternal introductory information form, a preterm infant introductory information form, a preterm infant physiological parameters follow-up form, and the Mother-Infant Bonding Scale (MIBS). The study included 3 study groups: the video call group, the video call with lullaby group, and the control group. Video calls between preterm infants and their mothers were made through Zoom for 5 to 10 minutes daily for 7 days. The mothers filled out the MIBS online before and on the 7th and 30th days of the study. Preterm infants in the video call and the video call with lullaby groups had higher MIBS mean scores on the 7th and 30th days of the study than their pretest MIBS scores. Preterm infants in the video call and the video call with lullaby groups had statistically significantly higher MIBS mean scores on the seventh day of the study than those in the control group. At the end of the 7-day study period, there was an improvement in the physiological parameters of preterm infants in the video call group and the video call with lullaby group compared with those in the control group, and this relationship was statistically significant. In conclusion, the implementation of video calls between mothers and preterm infants in NICUs had a healing effect on the physiological parameters of preterm infants and increased mother-infant bonding.

Early and consistent safe sleep practices in the neonatal intensive care unit: a sustained regional quality improvement initiative.

To increase compliance with standardized safe sleep recommendations for patients in a cohort of regional level III/IV neonatal intensive care units (NICUs) in accordance with recently revised guidelines issued by the American Academy of Pediatrics (AAP). A regional quality improvement (QI) initiative led by a multidisciplinary task force standardized safe sleep criteria across participating NICU sites. Universal and unit-specific interventions were implemented via Plan-Do-Study-Act (PDSA) cycles with evaluation of compliance through routine crib audits, run chart completion, and Pareto chart analysis. Following QI implementation, compliance with safe sleep guidelines for eligible NICU infants improved from 34% to 90% from October 2019 through September 2022. Compliance with early, consistent modeling of safe sleep practices nearly tripled in this cohort of regional NICUs. A standardized, timely approach to safe sleep transition demonstrated dramatic and sustained improvement in the practice and modeling of safe sleep behaviors in the NICU.

Being a "Good Parent" to a NICU Infant With a Major Congenital Anomaly.

In the United States, up to one-third of infants with a congenital anomaly require neonatal intensive care unit (NICU) hospitalization. Parents of these infants may have different decision-making priorities, which may be influenced by the timing of the infant's diagnosis. (1) To compare the ranked importance of decision-making beliefs for parents of infants who received a prenatal versus postnatal congenital diagnosis and (2) explore how parents describe their decision-making beliefs. A cross-sectional, sequential mixed-methods pilot design was applied to collect quantitative data using the Good Parent Ranking Exercise and further explore parents' decision-making beliefs through qualitative interviews. Maximum difference scaling/hierarchical Bayes estimation and content analysis were used to analyze the quantitative and qualitative data, respectively. Forty mothers completed the Good Parent Ranking Exercise and 20 mothers completed qualitative interviews. Four of the top 5 ranked parenting beliefs were shared by mothers in the prenatal and postnatal groups. Mothers in the postnatal group ranked "focusing on my child's quality of life" higher. Qualitative interviews revealed that previously identified decision-making beliefs were consistent in this NICU parent population, with 1 additional belief identified. Mixed-methods analysis revealed high concordance between the prenatal and postnatal groups. NICU nurses need to know that decision-making beliefs for parents who receive a prenatal versus postnatal congenital diagnosis, while largely similar, may have differences. Future research should explore decision-making beliefs in demographically diverse parent groups (ie, fathers, partnered vs nonpartnered couples) and effective strategies for promoting NICU parents' decision-making beliefs.

Parenting Expectations, NICU Experiences, and Maternal Psychological Outcomes: An Exploratory Mixed-Methods Study.

Infant neonatal intensive care unit (NICU) hospitalization increases maternal risk for psychological distress. However, no universal screening standards exist and predicting maternal risk remains challenging. Reconceptualizing maternal distress in relation to differences between parenting expectations and NICU experiences may illuminate commonalities across a range of experiences. This study explored parenting expectation-experience differences (EEDs) among NICU mothers and assessed correlations between EED scores and psychological outcomes 1 to 5 years post-NICU hospitalization. A 3-phase explanatory sequential mixed-methods design was used. Pearson's correlation coefficients were used to measure relationships between EED scores and maternal psychological outcomes. Reflexive thematic analysis of one-on-one, semi-structured interviews contextualized EED scores. Most participants (92.9%) reported negative EED scores, indicating NICU experiences fell short of parenting expectations. Significant inverse correlations were found between EED scores and maternal outcomes, including depression ( r = -0.25, P < .01), anxiety ( r = -0.25, P < .01) and posttraumatic stress disorder symptoms ( r = -0.41, P < .001), and perceived parenting self-efficacy ( r = -0.28, P < .01). Major qualitative themes included unexpected versus prepared, lost parenting experiences, and surviving and thriving. Data synthesis contextualized EED scores and revealed key differences in meaning ascribed to unmet parenting expectations. Preparing mothers for infant NICU hospitalization and creating a NICU parenting environment, which better supports mothers and their engagement in parenting tasks, may help to reduce differences between parenting expectations and NICU experiences. Further research is needed to elucidate the impacts of parenting EEDs in this population.

Effects of white noise on preterm infants in the neonatal intensive care unit: A meta-analysis of randomised controlled trials.

To critically assess the effects of white noise on the pain level, weight gain and vital signs (heart rate, respiratory rate and oxygen saturation) of preterm infants in neonatal intensive care units (NICUs). A systematic review and meta-analysis of randomised controlled trials (RCTs). Ten databases (PubMed, Cochrane Library, Embase, Web of Science, CINAHL, PsycINFO, SinoMed, China National Knowledge Infrastructure, VIP and Wanfang Data) were systematically reviewed from inception to July 2022. Two reviewers evaluated the risk of bias separately using the Cochrane Collaboration criteria and extracted data using a predesigned information form. The meta-analysis included eight eligible RCTs. According to statistical analysis, white noise significantly affected the pain level, weight gain, heart rate, respiratory rate and oxygen saturation in preterm infants. Regardless of the outcome measurement timing, gestational age and birth weight of preterm infants, subgroup analysis demonstrated that white noise reduced the pain level, heart rate and respiratory rate and promoted weight gain in preterm infants in NICUs. White noise is a practical and potentially useful therapy for premature neonates in NICUs. No Patient or Public Contribution.

The Stress Levels of Premature Infants' Parents and Related Factors in NICU.

Parental stress related to their infants' hospitalization is a significant concern that affects both parents and their infants. Fathers' experiences tend to be understudied compared to mothers. Further research on fathers' stress levels is necessary. While parental stress has been correlated with infant health severity, the specific causes and risk factors contributing to heightened stress levels in parents of neonatal intensive care unit (NICU) infants are not yet fully understood and require further investigation. This study aimed to examine the stress levels experienced by parents of premature infants in the NICU and to explore the factors associated with parental stress in this specific context. A cross-sectional observational design was used to accomplish this study, which was carried out on 743 parents from nine different NICUs located in governmental hospitals across various locations in Egypt. We used characteristics of parents and premature infants, and Parent Stress Scale was used for data collection. A majority of parents reported experiencing high stress in the following domains: sight and sound (80.3%), infants' appearance (69%), and the parent-infant relationship (81.4%). Additionally, about three-quarters (73.6%) of parents experienced high stress overall, with a mean score of 167.56 (21.3). About three-quarters of the parents experienced high overall stress levels. Also, factors that were found to affect parents' stress levels included premature infants connected to mechanical ventilators, previous neonatal death, parents living far from hospitals, infants delivered through cesarean section, insufficient income, and prolonged hospitalization beyond 5 days.

Pregnancy and infant outcomes following SARS-CoV-2 infection in pregnancy during delta variant predominance – Surveillance for Emerging Threats to Pregnant People and Infants

SARS-CoV-2 infection in pregnancy is associated with an increased risk of adverse birth outcomes such as preterm birth, stillbirth, and maternal and infant complications. Previous research suggests an increased risk of severe COVID-19 illness and stillbirth in pregnant people during delta variant predominance in 2021; however, those studies did not assess timing of infection during pregnancy, and few of them described COVID-19 vaccination status. Using a large population-based cohort, this study compared pregnancy and infant outcomes and described demographic and clinical characteristics of pregnant people with SARS-CoV-2 infection prior to and during the delta variant period. This retrospective cohort analysis included persons with confirmed SARS-CoV-2 infection in pregnancy from 6 US jurisdictions reporting to the Surveillance for Emerging Threats to Pregnant People and Infants Network. Data were collected through case reports of polymerase chain reaction-positive pregnant persons and linkages to birth certificates, fetal death records, and immunization records. We described clinical characteristics and compared frequency of spontaneous abortion (<20 weeks of gestation), stillbirth (≥20 weeks), preterm birth (<37 weeks), small for gestational age, and term infant neonatal intensive care unit admission between the time periods of pre-delta and delta variant predominance. Study time periods were determined by when variants constituted more than 50% of sequences isolated according to regional SARS-CoV-2 genomic surveillance data, with time periods defined for pre-delta (March 3, 2020-June 25, 2021) and Delta (June 26, 2021-December 25, 2021). Adjusted prevalence ratios were estimated for each outcome measure using Poisson regression and were adjusted for continuous maternal age, race and ethnicity, and insurance status at delivery. Among 57,563 pregnancy outcomes, 57,188 (99.3%) were liveborn infants, 65 (0.1%) were spontaneous abortions, and 310 (0.5%) were stillbirths. Most pregnant persons were unvaccinated at the time of SARS-CoV-2 infection, with a higher proportion in pre-delta (99.4%) than in the delta period (78.4%). Of those with infections during delta and who were previously vaccinated, the timing from last vaccination to infection was a median of 183 days. Compared to pre-delta, infections during delta were associated with a higher frequency of stillbirths (0.7% vs 0.4%; adjusted prevalence ratio, 1.55; 95% confidence interval, 1.14-2.09) and preterm births (12.8% vs 11.9%; adjusted prevalence ratio, 1.14; 95% confidence interval, 1.07-1.20). The delta period was associated with a lower frequency of neonatal intensive care unit admission (adjusted prevalence ratio, 0.74; 95% confidence interval, 0.67-0.82) than in the pre-delta period. During the delta period, infection during the third trimester was associated with a higher frequency of preterm birth (adjusted prevalence ratio, 1.41; 95% confidence interval, 1.28-1.56) and neonatal intensive care unit admission (adjusted prevalence ratio, 1.21; 95% confidence interval, 1.01-1.45) compared to the first and second trimester combined. In this US-based cohort of persons with SARS-CoV-2 infection in pregnancy, the majority were unvaccinated, and frequencies of stillbirth and preterm birth were higher during the delta variant predominance period than in the pre-delta period. During the delta period, frequency of preterm birth and neonatal intensive care unit admission was higher among infections occurring in the third trimester vs those earlier in pregnancy. These findings demonstrate population-level increases of adverse fetal and infant outcomes, specifically in the presence of a COVID-19 variant with more severe presentation.