Wait until your child turns one. They must hold their head up in a helmet and...

https://www./parenting/when-can-a-baby-go-in-a-bike-seat-an-age-by-age-guide/

Wait until your child turns one. They must hold their head up in a helmet and sit independently to handle road vibrations. Front seats suit smaller toddlers, while rear racks fit growing kids. Trailers offer the best stability for beginners