Background: Nonresponsive feeding styles can contribute to rapid weight gain in infancy and subsequent obesity in childhood. There is a need to investigate factors such as parental mental health symptoms (stress, depression, and anxiety) that may contribute to nonresponsive feeding styles. The purpose of this study was to investigate the relationship between parental mental health symptoms and feeding styles in parents of healthy, term formula-fed infants during the first year of life. Methods: A cross-sectional, descriptive correlational design was employed using online surveys. We recruited participants through Facebook groups and pediatricians' offices. Instruments included a demographic questionnaire, the Perceived Stress Scale-10, Patient Health Questionnaire-Depression Module-9, 7-item Generalized Anxiety Disorder Assessment, and Infant Feeding Style Questionnaire. Results: Participants were 306 parents of formula-fed infants. Greater depressive symptoms was the strongest predictor of the pressuring style (β = 0.54), while greater symptoms of stress (β = -0.13) and anxiety (β = -0.28) were associated with lower pressuring scores. Greater depressive symptoms was the strongest predictor of the laissez-faire style (β = 0.48), while greater symptoms of stress (β = -0.17) and anxiety (β = -0.23) were associated with lower laissez-faire scores. Engaging in ≤50% of the infant's feeds was the strongest control variable predictor for the pressuring and laissez-faire styles. None of the mental health variables were significantly related to the restrictive style. Conclusions: We recommend increased screening for depressive symptoms in parents of infants and responsive feeding support, especially for those experiencing depressive symptoms.