Legal Question in Personal Injury in California

It may or may not be legal depending on the various codes in your jurisdiction.

BUT A RESPONSIBLE ADULT DOES NOT PLACE A BABY AT GREAT RISK.

Riding a bike with a baby in back pack offers absolutely no protection for the child if the bike goes down for any reason - a car strike, a rut, any number of reasons.

Start thinking - put the child in a child restraint seat in a car.

I believe any cop that caught you doing that would arrest you for child endangerment. Really though, this question is so outlandishly stupid that I can't help but wonder if it's just a troll. I mean, why not stuff the kid in a mailbox while you're at it? Seriously!

On the off chance that this is a serious question from a truly uneducated person who has no other mode of transportation: there are safe ways to transport your child by bicycle. The Bell New Classic Child Carrier Seat can be bought at Target for only $43. It fits on the back, behind the rider, and is perfectly legal and safe for kids up to 40 lbs. You still need to get the kid a helmet. But if the child is just an infant and can't sit up..... you'll have to take the BUS!