Specific working conditions may endanger pregnant women's and their children's health. Switzerland has specific legislation for the protection of pregnant and breastfeeding employees. However, the implementation of these provisions presents important shortcomings. Attending physicians or gynaecologists-obstetricians who care for pregnant women have a central role in controlling the efficacy of protective measures put in place for their patients at work. What are the occupational exposures at risk and their health impact ? What are the collaboration with the different actors involved in the protection of maternity at work ? What steps should be taken if occupational dangers are identified? What tools can be used ? This article answers and explore these questions.