Around two thirds of pregnancies involve weight gain outside the recommended range, new data has found. The analysis, published in the BMJ, pooled data on 1.6 million women worldwide, highlighting the urgent need for updated standards for healthy weight gain in pregnancy. Gestational weight gain (GWG)—the combined growth of mother and baby—is closely linked to maternal and infant health. Excessive or insufficient gain increases the risk of complications that can persist into later life. Yet