Wait until your child is one. They must sit independently and support their...

https://blast-wiki.win/index.php/My_Kid%E2%80%99s_Feet_Keep_Coming_Out_of_the_Straps:_A_Service_Writer%E2%80%99s_Guide_to_Seat_Stability

Wait until your child is one. They must sit independently and support their head while wearing a helmet. Trailers provide the safest environment for infants, while front or rear seats suit active toddlers. Keep your first rides short and smooth.