might throw his balance off a little. i can understand you feeling nervous about it but i think the helmet might be a bit much. you just have to keep an eye on them and if they do happen to hit their head, know what to look for to make sure it isn't a serious injury. i think babies are sturdier than they look in some ways. my daughter has taken her fair share of tumbles but she has always been okay afterward. a month or so ago, we stayed in a hotel and she slept on the bed with me. in the middle of the night she fell off the bed and landed right on her head. i kept her up from 1:30am until 3:00am or so to make sure she was alright because they say not to let someone go straight to sleep after hitting their head. my husband thought i was a little nuts but, whatever. i just wanted to be sure.