yeah sure its normal. but i think sperm starts producing at age 13+ so...
Its quite normal. As the previous poster stated you need to place limits on where your son masterbates i.e. only in his room, in private. Best wishes...
My 3 1/2 year old loves playing with his wee wee. Don't all boys? We give him limits, and tell him he can only play with it "in private" - like, when no one else is home, or in bed. He will ask me, "Can I play with my wee wee?" I can't relate, being a mom. My husband thinks it's great that he "found it". Good luck.