Maternal pre‐pregnancy body mass index, gestational weight gain and child weight during the first 2 years of life in an Amazonian birth cohort.

Background: In socially vulnerable populations, evidence is needed regarding the role of maternal nutritional status on child weight during the first 2 years of life. Objectives: We aimed to assess the association of pre‐pregnancy body mass index (BMI) and gestational weight gain (GWG) with offspring BMI‐for‐age z‐scores (BAZs) during the first 2 years of life. Methods: A population‐based birth cohort study was conducted with 900 mother–child pairs. Pre‐pregnancy weight and weight at delivery were collected from medical records, and anthropometric data were measured at birth and at 6‐month, 1‐year and 2‐year follow‐up visits. Linear regression and linear mixed‐effect models assessed associations with pre‐pregnancy BMI, GWG and BAZ during the first 2 years of life. Results: Pre‐pregnancy overweight and obesity and excessive GWG were positively associated with BAZ at birth and at 1‐ and 2‐year follow‐up visits. There were no significant additional BAZ changes per year based on the exposures up to age 2 years. Conclusions: Elevated maternal pre‐pregnancy BMI and GWG were associated with a child's higher BAZ at birth, and these differences remained constant throughout the first 2 years of life in Amazonian children. These findings highlight the importance of promoting adequate maternal weight before pregnancy and during prenatal care also in socially vulnerable populations. Key points: Pre‐pregnancy overweight and obesity and excessive gestational weight gain were associated with child's higher BMI‐for‐age z at birth, and these differences remained constant throughout the first 2 years of life in Amazonian children.Strategies that promote adequate maternal weight before and during pregnancy are necessary in socially vulnerable populations. [ABSTRACT FROM AUTHOR]