well im going to say hold him back....when he's at school, he'll be at school till he's nearly 18!! cherish that extra year at home. but i also say that because i do think that kids tend to go better at school when they're held back that little bit. if he's at a pre school with a good education program, he will be getting all he needs until he starts school. i held DS back a year (he will be turning 6 in may) he was soooo not ready last year, but this year, he is going so well at school. he's just picking everything up right away, and he is absolutely loving it. but i know that's just my son, every kid is different....if you're still undecided by the end of the year,take him to orientation at the local school and see what they say?