Article L1225-12 of the French Labour Code
The employer shall offer an employee who works in a job that exposes her to risks determined by regulation another job that is compatible with her condition: 1° When she is in a medically certified state of pregnancy ; 2° When she has given birth, taking into account the repercussions on her health or breastfeeding, during a period not exceeding one month after her return from postnatal leave.