My lo is 10.5 months old and recently started to bang his head on things thinking its funny. Before you guys says get him checked for autism he isnt showing any other signs (i was an rbt for 4 years). He really only does it when he knows theres something behind him. The only time he does it "hard" is in his high chair. If he does it in the playpen he does it soft. I just donf like him doing it and i worry about him getting hurt. At first a soft no worked then simply me reacting to it made him laugh and do it more. I dont like when he does it in the high chair cause sometimes he'll do it with food in his mouth so i dont want him to choke. Ive tried ignoring him sometimes it works and sometimes a firm no works. Is this a phase im hoping it goes away soon. Thats been my only concern cause i cant seem to get him to stop. Hes been in such a testy mood because he thinks its funny. Hes so smart and goofy.