Wait until your baby sits up steadily and holds their head well while wearing a...

https://www.bookmarks4all.win/most-pediatricians-suggest-waiting-until-your-child-can-sit-up-independently

Wait until your baby sits up steadily and holds their head well while wearing a helmet, usually around 10 months. Front seats keep toddlers close, rear seats offer extra stability, and trailers work perfectly for naps