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INTRODUCTION: Type 1 diabetes mellitus (T1DM) during pregnancy is associated with increased risk of maternal and fetal complications. We aimed to compare the risk of adverse perinatal outcomes in women with pregestational T1DM to those of background population. METHODS: In this historical cohort study, we included Mexican pregnant women who attended from 2016 to 2021 a tertiary-level hospital in Mexico City. Group 1: Pregnant women with T1DM; group 2: pregnant women without diabetes, matched 1:2 by maternal age, pregestational body mass index (BMI), gestational age at admission and parity with women of group 1. Relative risk (RR) with a 95% CI was calculated using logistic regression. We had IRB approval. RESULTS: Group 1, n=203; group 2, n=406; there were no differences in maternal age, pregestational BMI, gestational age, and parity. The mean glycated hemoglobin A1C and gestational age at admission to prenatal care in T1DM women were 8.0±2.0 and 19.1±6.6, respectively. The risk of adverse perinatal outcomes was increased in women with T1DM and were expressed as RR (95% IC); preterm birth, 4.03 (3.0–5.3); preeclampsia, 5.2 (3.3–8.3); cesarean birth, 1.5 (1.3–1.7); miscarriage, 34 (4.5–253); congenital malformations, 8.5 (3.8–19.1); neonatal hypoglycemia, 15 (3.4–64); hyperbilirubinemia, 2.8 (1.6–4.9); respiratory distress syndrome, 8.6 (3.6–20); and large for gestational age, 6.8 (3.7–12.4). CONCLUSION: The risk of adverse perinatal outcomes was increased in Hispanic women with T1DM compared with general population. These adverse outcomes show the critical importance to prioritize education to patients and resources for glucose control to improve outcomes before and during pregnancy. [ABSTRACT FROM AUTHOR]