The Ontario Birth Study (OBS) was established in 2013 to follow women through pregnancy and postpartum to better our understanding of pregnancy complications while improving maternal and infant health.

In 2018, we began following up with mothers and children at various times after birth (currently up to 4 years) in OBS Kids. OBS aims to create a resource for researchers to determine the mechanisms that underlie pregnancy complications and identify factors related to child development and long-term health outcomes.

Studies are already being undertaken to examine the drivers and biomarkers of pregnancy complications including growth restriction, preeclampsia, and preterm birth. Other studies are determining how events during pregnancy and early postnatal life relate to later life health, learning and social functioning. The OBS exists to allow the development of strategies that promote long-term trajectories towards health and away from disease.