Wait until age one before riding. Your baby needs solid neck strength to...

https://www.apu-bookmarks.win/wait-until-your-baby-sits-unassisted-with-steady-neck-control-usually-around

Wait until age one before riding. Your baby needs solid neck strength to support a helmet and handle bike motion. Look for independent sitting skills. Front seats offer interaction, rear seats add stability, and trailers provide the safest start.