Abstract
Objective
Current guidelines for maternal weight gain in twin pregnancy were established in the absence of evidence on its longer-term consequences for maternal and child health. We evaluated the association between weight gain in twin pregnancies and the risk of excess maternal postpartum weight increase, childhood obesity, and child cognitive ability.
Methods
We used 5-year follow-up data from 1000 twins born to 450 mothers in the Early Childhood Longitudinal Study—Birth Cohort, a nationally representative U.S. cohort of births in 2001. Pregnancy weight gain was standardized into gestational age- and prepregnancy body mass index (BMI)-specific z-scores. Excess postpartum weight increase was defined as ≥10 kg increase from prepregnancy weight. We defined child overweight/obesity as BMI ≥ 85th percentile, and low reading and math achievement as scores one standard deviation below the mean. We used survey-weighted multivariable modified Poisson models with a log link to relate gestational weight gain z-score with each outcome.
Results
Excess postpartum weight increase occurred in 40% of mothers. Approximately 28% of twins were affected by overweight/obesity, and 16 and 14% had low reading and low math scores. There was a positive linear relationship between pregnancy weight gain and both excess postpartum weight increase and childhood overweight/obesity. Compared with a gestational weight gain z-score 0 SD (equivalent to 20 kg at 37 weeks gestation), a weight gain z-score of +1 SD (27 kg) was associated with 6.3 (0.71, 12) cases of excess weight increase per 1000 women and 4.5 (0.81, 8.2) excess cases of child overweight/obesity per 100 twins. Gestational weight gain was not related to kindergarten academic readiness.
Conclusions
The high prevalence of excess postpartum weight increase and childhood overweight/obesity within the recommended ranges of gestational weight gain for twin pregnancies suggests that these guidelines could be inadvertently contributing to longer-term maternal and child obesity.
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Computer code and data will not be available due to data use agreements with the U.S. Department of Education.
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This study is supported by grant funding from the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) R01 HD094777 to LMB and JAH. JAH holds a Canada Research Chair in Perinatal Population Health from the Canadian Federal Government. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The authors declare no other competing interests.
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Bodnar, L.M., Cartus, A.R., Parisi, S.M. et al. Pregnancy weight gain in twin gestations and maternal and child health outcomes at 5 years. Int J Obes 45, 1382–1391 (2021). https://doi.org/10.1038/s41366-021-00792-8
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DOI: https://doi.org/10.1038/s41366-021-00792-8
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