Wait for age 9-12 months when your child sits independently and holds their...

https://www.emergbook.win/wait-until-your-baby-hits-nine-to-twelve-months-before-riding-your-child-needs

Wait for age 9-12 months when your child sits independently and holds their head steady in a helmet. Trailers offer maximum security, while front or rear seats allow for more connection. Start slow and keep rides short for happy, safe family trails.