Wait until your baby sits upright unsupported and holds their head steady with...

https://www.apu-bookmarks.win/wait-until-your-baby-sits-unassisted-with-steady-neck-control-usually-around

Wait until your baby sits upright unsupported and holds their head steady with a helmet. Most start around age one. Front seats keep kids close, while rear seats handle older toddlers. Trailers offer the best stability for small passengers