OR15-04 Accelerated Longitudinal Weight Gain Among Infants With In Utero COVID-19 Exposure

Disclosure: M.W. Ockene: None. S.C. Russo: None. H. Lee: None. C. Monthé-Drèze: None. T.L. Stanley: Consulting Fee; Self; RosVivo Therapeutics. Grant Recipient; Self; Pfizer, Inc. I.L. Ma: None. M. Toribio: None. L.L. Shook: None. S.K. Grinspoon: Consulting Fee; Self; Theratechnologies. A.G. Edlow: Consulting Fee; Self; Mirvie, Inc. Grant Recipient; Self; Merck. L.T. Fourman: Consulting Fee; Self; Amryt Pharmaceuticals. Grant Recipient; Self; Amryt Pharmaceuticals. Background: Since its initial outbreak in 2019, coronavirus disease 2019 (COVID-19) has led to unprecedented morbidity and mortality worldwide. Due to a high burden of infection among pregnant women, a novel population of children with in utero exposure to maternal COVID-19 has emerged for which health outcomes are largely unknown. Given the role of the intrauterine environment in shaping chronic disease risk over the life course through effects on fetal programming, there is a pressing need to delineate longitudinal growth patterns among infants born to mothers with COVID-19 during pregnancy. Methods: We conducted a longitudinal cohort study leveraging a prospectively-enrolled perinatal biorepository among 149 infants with in utero exposure to maternal COVID-19 and 127 unexposed controls. Weight, length, and BMI were abstracted from health records at 0, 2 (±0.5), 6 (±1), and 12 (±1) months and standardized using World Health Organization (WHO) growth charts. Linear mixed effect and linear regression models were used to examine differences in anthropometric z-score trajectories over the first year of life between groups. Analyses were adjusted for maternal age, ethnicity, parity, insurance type, and BMI as well as infant sex, birthdate, and breastfeeding. Our pre-specified primary endpoint was change in BMI z-score from birth to 12 months. Results: Infants with in utero COVID-19 exposure versus controls exhibited differential trajectories of weight and BMI, but not length, z-scores over the first year of life (study group x time interaction, P < 0.0001 for weight and BMI z-scores). Infants born to mothers with prenatal COVID-19 had lower BMI z-score at birth (effect size: -0.35, 95% CI, -0.66 to -0.03) and greater increase in BMI z-score from birth to 12 months (effect size: 0.53, 95% CI, 0.06 to 0.99). Change in BMI z-score was greater than the WHO population average of 0 within the exposed (P < 0.0001) but not the unexposed group. Birth weight z-score was found to mediate a significant proportion of the relationship between COVID-19 exposure and postnatal growth (estimate ± standard error, 32 ± 14%, P = 0.02). Conclusions: Infants with in utero exposure to maternal COVID-19 were found to exhibit lower birth weight and accelerated weight gain over the first year of life compared to their unexposed peers. The exaggerated growth trajectory observed in these children may be a catch-up response to a prenatal growth deficit. Lower birth weight and accelerated postnatal weight gain are established risk factors for obesity, abdominal adiposity, and cardiovascular disease later in life. Thus, children born to mothers with prenatal COVID-19 may be at heightened risk of long-term cardiometabolic complications and require close monitoring over the life course. Further studies are now needed to delineate cardiometabolic sequelae of in utero COVID-19 exposure among this emerging global population. Presentation: Friday, June 16, 2023