Is it normal for a 15 month old to bang their head against the wall when they seem happy? I know occasionally some parents may feel like doing it, but I had been a bit worried by Maggie’s tendancy to tap her forhead against the wall. She also likes to slap her head with her hands. Apparently, it’s okay. I was reading The Mother of All Toddler books by Ann Douglas last night and came across a note about head banging that said one in five toddlers will do it, either to relieve the pain of teething, relieve stress or when they are mad.