Wait until your child sits up and supports their own head, usually near age...

https://www.last-bookmarks.win/wait-until-your-child-has-strong-neck-control-and-sits-independently-usually

Wait until your child sits up and supports their own head, usually near age one. Front seats work well for toddlers, while rear seats suit older kids. Trailers offer a secure, reclined ride for the youngest. Check that helmet fit and enjoy the trip.