Importance Both low and high gestational weight gain have been associated with adverse
maternal and infant outcomes, but optimal gestational weight gain remains uncertain and
not well defined for all prepregnancy weight ranges. Objectives To examine the association
of ranges of gestational weight gain with risk of adverse maternal and infant outcomes and
estimate optimal gestational weight gain ranges across prepregnancy body mass index
categories. Design, Setting, and Participants Individual participant-level meta-analysis using …