Definitely some good info...but I would be curious to know what people do before the kid can hold his/her head up. Has someone figured out a safe way to take the really little ones (carseat in trailer/bakfiets?)? Seems like this would be more of an issue for urban families who use bikes for transportation...for people riding recreationally I would imagine the preferred option is to leave the child with the other parent/a sitter/etc. if at all possible while going out for a ride.