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To evaluate the association between the dimension of deviation from appropriate gestational weight gain (GWG) and adverse maternofetal outcomes in women with gestational diabetes mellitus (GDM). We performed a multicentric retrospective study based on the Portuguese GDM Database. Women were classified as within GWG, insufficient (IGWG) or excessive (EGWG) than the Institute of Medicine recommendations. EGWG and IGWG were calculated for each prepregnancy BMI category. Large-for-gestational-age (LGA) and macrosomia were defined as a birthweight more than the 90th percentile for the gestational age and newborn weight greater than 4000 g, respectively. Logistic regression models (adjusted odds ratio [aOR] plus 95% confidence interval [95%CI]) were derived to evaluate the association between EGWG or IGWG and adverse maternofetal outcomes. A total of 18961 pregnant women were included: 39.7% with IGWG and 27.8% with EGWG. An EGWG over 3 kg was associated with a higher risk of LGA infants (aOR 1.95, 95%CI 1.17–3.26) and macrosomia (aOR 2.01, 95%CI 1.23–3.27) in prepregnancy normal weight women. An EGWG greater than 4 kg was associated with a higher risk of LGA infants (aOR 1.67, 95%CI 1.23–2.23) and macrosomia (aOR 1.90, 95%CI 1.38–2.61) in obese women. In overweight women, an EGWG above 3.5 kg was associated with a higher risk of LGA infants (aOR 1.65, 95%CI 1.16–2.34), macrosomia (aOR 1.85, 95%CI 1.30–2.64), preeclampsia (aOR 2.40, 95%CI 1.45–3.98) and pregnancy-induced hypertension (aOR 2.21, 95%CI 1.52–3.21). An IGWG below −3.1 kg or −3kg was associated with a higher risk of small-for-gestational-age [SGA] infants in women with normal (OR 1.40, 95%CI 1.03–1.90) and underweight (OR 2.29, 95%CI 1.09–4.80), respectively. Inappropriate gestational weight gain seems to be associated with an increased risk for adverse maternofetal outcomes, regardless of prepregnancy BMI. Beyond glycemic control, weight management in women with GDM must be a focus of special attention to prevent adverse pregnancy outcomes.KEY MESSAGESThe dimension of deviation from appropriate gestational weight gain was associated with an increased risk for adverse maternofetal outcomes among women with gestational diabetes.Weight management must be a focus of special attention in women with gestational diabetes to prevent adverse pregnancy outcomes. The dimension of deviation from appropriate gestational weight gain was associated with an increased risk for adverse maternofetal outcomes among women with gestational diabetes. Weight management must be a focus of special attention in women with gestational diabetes to prevent adverse pregnancy outcomes.

Inappropriate gestational weight gain impact on maternofetal outcomes in gestational diabetes