Most babies join the ride around 9-12 months. Your little one must support...

https://echo-wiki.win/index.php/What_is_Safer_on_a_Busy_Street:_Trailer_or_Rear_Seat%3F

Most babies join the ride around 9-12 months. Your little one must support their head well in a helmet first. Front seats keep them close, rear seats suit growing toddlers, and trailers offer the safest, lowest center of gravity