Context  Knowledge about the effects of exposure to the newer antipsychotics during pregnancy is limited.

Objective  To investigate the effects of maternal use of antipsychotics during pregnancy on gestational diabetes and fetal growth.

Design  Population-based cohort study comparing women exposed and not exposed to antipsychotics during pregnancy. Exposure was defined as prescriptions filled.

Setting  Swedish national health registers.

Participants  All women giving birth in Sweden from July 1, 2005, through December 31, 2009, grouped by filled prescriptions for (1) olanzapine and/or clozapine, the most obesogenic a