Ready for a bike ride? Aim for 9–12 months when neck muscles support a helmet....

https://www.protopage.com/haley_murphy04#Bookmarks

Ready for a bike ride? Aim for 9–12 months when neck muscles support a helmet. If your baby sits upright unsupported, front or rear rack-mounted seats work great. Before that milestone, use a trailer with an infant insert. Prioritize neck stability!