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Objectives: This study aimed to assess the applicability of the National Academy of Medicine (NAM) interim guidelines for twin pregnancies to the specific population of gestational diabetes mellitus by exploring the relationship between gestational weight gain and adverse pregnancy outcomes in Chinese twin-pregnant women with gestational diabetes mellitus., Study Design: This was a retrospective cohort study of women diagnosed with diabetes in pregnancy between July 2017 and December 2020 at the Maternal and Child Health Hospital in Chongqing, China. The primary variable of interest was maternal total gestational weight gain. The primary outcomes were perinatal outcomes, which included: preeclampsia, small for gestational age, large for gestational age, low birth weight, neonatal pneumonia, neonatal respiratory distress syndrome, and neonatal intensive unit admission, etc. The association between inappropriate gestational weight gain and adverse pregnancy outcomes was estimated using multiple logistic regression analysis., Results: A total of 455 twin-pregnant women who had gestational diabetes mellitus were analyzed. Women with low gestational weight gain had reduced risk of preeclampsia (adjusted odds ratio [aOR], 0.32; 95% CI or confidence interval, 0.17-0.63; p  = 0.001) and their infants had higher risks of small for gestational age (aOR, 1.93; 95% CI, 1.04-3.58; p  = 0.037), low birth weight (aOR, 2.27; 95% CI, 1.32-3.90; p  = 0.003), neonatal intensive unit admission (aOR, 3.29; 95% CI, 1.10-5.78; p  = 0.038), pneumonia (aOR, 2.41; 95% CI, 1.08-5.33; p  = 0.031), and neonatal respiratory distress syndrome (aOR, 2.29; 95% CI, 1.10-4.78; p  = 0.027); the infants of women with excessive gestational weight gain had a higher risk of large for gestational age (aOR, 3.76; 95% CI, 1.42-9.96; p  = 0.008)., Conclusion: Gestational weight gain controlled within the range recommended by the NAM could reduce the risk of perinatal adverse outcomes. The 2009 NAM gestational weight gain recommendations can be used for Chinese twin-pregnant women with gestational diabetes mellitus., Key Points: · Inappropriate gestational weight gain can lead to adverse perinatal outcomes in twin pregnancies.. · Gestational weight gain controlled within recommended range could reduce the risk of poor perinatal outcomes.. · The National Academy of Medicine recommendations are suitable for Chinese twin-pregnant women with GDM.., Competing Interests: None declared., (Thieme. All rights reserved.)

Aim: To examine the optimal gestational weight gain (GWG) for Chinese pregnant women with gestational diabetes mellitus (GDM) based on the Chinese-specific body mass index (BMI) classification., Methods: A retrospective cohort study was conducted using the 2017-2020 data from pregnant women with GDM in a tertiary hospital. A quadratic function model and the total predicted probability of adverse pregnancy outcomes were developed to obtain the optimal GWG. Differences in the incidence of adverse pregnancy outcomes between our optimal GWG recommendations and the Institute of Medicine (IOM) 2009 GWG guidelines were also analyzed., Results: A total of 8103 pregnant women with GDM were analyzed. Based on the Chinese-specific BMI classification, the optimal GWG range was 11.0-17.5 kg for underweight women, 3.7-9.7 kg for normal-weight women, -0.6 to 4.8 kg for overweight women, and - 9.8 to 4.2 kg for obese women. Excessive GWG had a higher risk of large for gestational age (LGA) (OR: 2.99, 95% CI: 2.42-3.70), macrosomia (OR: 2.35, 95% CI: 1.77-3.12), pre-eclampsia (OR: 1.91, 95% CI: 1.37-2.65), gestational hypertension (OR: 1.65, 95% CI: 1.24-2.19), cesarean section (OR: 1.29, 95% CI: 1.15-1.44), postpartum hemorrhage (OR: 1.29, 95% CI: 1.02-1.64); insufficient GWG had a higher risk of small for gestational age (OR: 1.82, 95% CI: 1.20-2.75). Compared to the IOM 2009 GWG guidelines, the prevalence of macrosomia, LGA, and postpartum hemorrhage were significantly lower in pregnant women following the implementation of our recommended GWG range (p < 0.05)., Conclusions: Compared to the IOM 2009 GWG recommendations, our optimal GWG recommendations for Chinese pregnant women were more sensitive., (© 2022 Japan Society of Obstetrics and Gynecology.)