This paper investigates the impact of women's entry into academia on their fertility decisions, and how the number of children affects research productivity across all research disciplines in France. Using a novel dataset including theses defended in French universities, data from Scopus, and the Conseil National des Universités (CNU). I plan to study how the time before achieving a stable position in academia affects women and men researchers and how it affects fertility among female researchers. Second, I want to analyze how having children impacts female researchers' productivity, employing an event-study strategy around the time of the first child. These findings would contribute to understanding the complex interplay between family dynamics and professional pursuits, providing valuable insights for both researchers and policymakers.