Head banging...

My last 2 did this, especially the last. He's 2 1/2 and doesn't do it much anymore, the peek was right around 2 and especially when we were at Disney World in June. He woudl bang his head on the ground, concrete especially or if we were holding him and he couldn't bang his head he would pull his hair and smack himself. He had his 2 year checkup the week after Disney and the Dr said he'll stop when he hurts himself bad enough. Apperently the perpetual goose egg he had on his forhead for 6-8 months wasn't hurting him enough! Like I said he hardly does it