Wait until your baby sits independently and holds their head steady while...

https://iris-wiki.win/index.php/Do_Kids_Need_Eye_Protection_in_a_Bike_Seat%3F_A_Mechanic%E2%80%99s_Guide_to_Keeping_Their_Eyes_Open

Wait until your baby sits independently and holds their head steady while wearing a helmet. Start with a trailer for infants. Transition to a front seat for interaction or a rear seat for stability as they grow. Always prioritize smooth paths