We leave for France in November 2021. If you, like me, have children traveling with you, the French rules are very difficult to follow. After I read that the French were banning unvaccinated travelers, I searched the web for any guidance or information concerning children. I found the link below which appears to be fairly reliable. Since children under 12 are exempt from testing, it would also follow that the restrictions for unvaxxed travelers would not apply to them.
https://www.osac.gov/Content/Report/276c9731-ac96-4553-9626-1c87fb8c2319