Until 3 monthes or 4 for max because after that baby have to sleep on the sides and change positions to evoid the problème of the flat head syndrome

"From birth to 4-6 months: Do not use the pillow when the baby can turn over on its own. https://www.4mybaby.ch/babymoov-babystuetze-cosydream-24039?number=SWA050416