Article R1225-14 of the French Labour Code
At least fifteen days before the start of the parental presence leave, the employee shall inform his employer by registered letter with acknowledgement of receipt or delivered against receipt of his wish to take this leave. The employee must enclose a medical certificate. When the parental presence leave is requested under the conditions provided for in the last paragraph of article L. 1225-62, he must also enclose the favourable opinion…