As a parent who spent years fitting bike seats and trailers, I know the biggest...

https://mill-wiki.win/index.php/How_Do_I_Choose_Between_a_Frame-Mounted_and_Rack-Mounted_Child_Seat%3F

As a parent who spent years fitting bike seats and trailers, I know the biggest question is when to start. Your baby needs solid neck strength and the ability to sit up without help before joining your ride