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Background Breastfeeding seems to be inversely related to postpartum weight retention (PPWR), but this relationship is unclear in women with GDM. We aimed to describe the association between breastfeeding and PPWR at 1 year postpartum in women with GDM. Methods Multicentre cohort study of 524 women with GDM enrolled in prenatal clinics of the Brazilian National Health System and followed by telephone up to one year postpartum. Socio-demographics and pre-gestational weight were obtained during recruitment. Breastfeeding and post-partum maternal weight through telephone calls. PPWR was defined as 1-year postpartum weight minus pre-pregnancy weight and categorized as above and below the 80th sample percentile of retention. Breastfeeding was categorized as duration greater or less than 6 months. Adjusted Poisson regression was performed to assess relative risks (RR). Results Most women were 30 to 39 years old (50.6%), multiparous (71.0%), 39.5% completed high school, 60.1% were non-white (60.1%). Mean pre-gestational BMI was 30.42 (± 6.7) kg/m² and the mean weight gain during pregnancy was 9.5 (± 7.1) kg. After adjustments for previous variables, breastfeeding for 6 months or more reduced by 35% (RR 0.65; 95% CI 0.47; 0.90, p &amp;lt; 0.01) the incidence of 1-year PPWR up to 80th percentile (≥7Kg) compared to breastfeeding less than 6 months. Conclusions Breastfeeding up to 6 months might be encouraged in women with GDM to help preventing higher levels of 1-year PPWR. Key messages Breastfeeding up to 6 months was associated with less PPWR at 1 year after delivery in women with GDM.

1309Breastfeeding and weight retention in women with Gestational Diabetes Mellitus (GDM): LINDA-Brasil Cohort