This paper provides evidence that supports the hypothesis that nursery schools have positive impacts on mothers’ probability of employment (close to 15 percentage points). Unobserved heterogeneity among mothers is controlled by using a panel of data on mothers who have raised at least two children. Results are driven by partnered mothers. When education is considered, results are due to the response of mothers that at most have graduated from high school. There is high persistence: working six months before pregnancy is strongly associated with working after that. More research is necessary, mothers may be trapped in a non-employment situation.