mine started at 8 months and hasn't stopped since. I know it seems like a century but don't rush him, every baby is different. and to be honest once they get going, they don't stop and boys are clumsy. my son is now 14 months and seriously so adventurous and daring he has a new bruise every week. let him be little while you can
it was pretty stressful for me cuz the dr. told me that if he didn't started walking by 15 months we would have to start thinking on therapy and every day without hom walking was the worst for me , he didn't wanted to push toys, barely wanted to walk holding my hand and all of the sudden on Christmas eve he just started walking all over the house lol non stop... exactly 5 days before turning 15 months ... that was my Christmas miracle