Book excerpt: These guidelines have been developed to enable professionals to assist women who are pregnant, or have recently had a child, and who use alcohol or drugs or who have a substance use disorder, to achieve healthy outcomes for themselves and their fetus or infant. They have been developed in response to requests from organizations, institutions and individuals for technical guidance on the identification and management of alcohol, and other substance use and substance use disorders in pregnant women. They were developed in tandem with the WHO recommendations for the prevention and management of tobacco use and second-hand smoke exposure in pregnancy.