This Collection brings together sources within the Innovation Gateway containing data on medication exposure during pregnancy and/or relevant outcomes. Included is a report from the Human Medicines Expert Working Group on Optimising Data on Medicines used During Pregnancy. The report sites many of the data assets included within this Collection. The Expert Working Group was set up to to identify ways to improve data collection and access to information relevant to research on medicines used during pregnancy and breastfeeding. The Group advises on the following: - Better capturing and linking of existing data on adverse outcomes of pregnancy - Other ways to capture relevant information on exposure to all medicines during pregnancy - Improving access to all relevant data on medicines taken during pregnancy to enable studies to be conducted to support pharmacovigilance - Improving the analytic design of studies examining drug safety in pregnancy - To make recommendations - This report outlines their findings and recommendations.