Using covariate‐adjusted multilevel linear spline models (4 splines: 0–1.6, 1.6–6, 6–17 and 17–60 months), we compared weight, height and body mass index (BMI) z‐score trajectories of: (1) 76 offspring exposed to metformin (OGDM‐Metformin) and 420 offspring exposed to insulin (OGDM‐Insulin); (2) OGDM‐Metformin and 9171 offspring not exposed to GDM (No‐GDM); (3) OGDM‐Insulin and No‐GDM. Here, INS is linked to gestational diabetes.