INTRODUCTION: Previous literature suggests that patients with type 1 diabetes (T1DM) utilizing continuous subcutaneous insulin infusion (CSII) have lower hemoglobin A1c values compared to multiple daily injections (MDI). Despite improved glycemic control, rates of large for gestational age (LGA) infants are not different between these groups. This study investigates differences in glycemic profiles between CSII and MDI glucose logs. METHODS: Retrospective cohort study of all singleton pregnancies complicated by T1DM from 2012-2016. Patients were separated into groups by insulin delivery method. Glucose logs were reviewed for each trimester and a median glucose, interquartile range (IQR), and glycemic variability (IQR/median glucose) were calculated. Continuous data was compared using the Wilcoxon rank sum test. Spearman correlation coefficients were calculated comparing trimester specific median glucose and glycemic variability with neonatal birth weight percentile. RESULTS: 117 patients met inclusion criteria with 37,262 fasting and post-prandial values recorded. The rate of LGA was not different between groups (CSII: 57%, MDI: 49%; p=.370) despite CSII users having both a lower early A1c (<20 weeks [6.8% vs. 8.6%; <.001]) and late A1c (>26 weeks [6.5% vs. 6.9%; p=.008]) when compared to MDI users. Median reported glucose values were similar between groups, but glycemic variability was substantially increased in CSII users. However, glycemic variability did not correlate with birthweight percentile in any trimester independent of insulin delivery method. CONCLUSION: Patients using CSII have lower A1c values, but significantly more glycemic variability when compared to MDI users. However, degree of glycemic variability does not correlate with neonatal birthweight percentiles.