Wait until your baby turns one and sits up firmly unassisted. Strong neck...

https://www.romeo-bookmarks.win/most-kids-hit-the-path-by-age-one-confirm-your-child-holds-their-head-up

Wait until your baby turns one and sits up firmly unassisted. Strong neck control is vital for safety before you consider a bike ride. Choose front seats for close connection, rear mounts for extra support, or trailers for maximum stability