Importance Body mass index (BMI) and gestational weight gain are increasing globally. In
2009, the Institute of Medicine (IOM) provided specific recommendations regarding the ideal
gestational weight gain. However, the association between gestational weight gain
consistent with theIOM guidelines and pregnancy outcomes is unclear. Objective To perform
a systematic review, meta-analysis, and metaregression to evaluate associations between
gestational weight gain above or below the IOM guidelines (gain of 12.5-18 kg for …