B.C.
I do NOT recommend a booster at ALL for this age! My daughter has been out of a booster for at least a year and she's 3 1/2. He needs to learn that there are rules and consequenses for not sitting. 4 is way beyond knowing that. Not trying to sound rude at all... My kid is CRAZY!!! She's non-stop and wild, but with time-outs (supernanny style), she has learned very quickly that sitting and eating is her best option.