My LG started doing this a couple of months ago… hoping it’s just a phase but I’ve had to try and ignore it in all honesty now (unless I need to get involved) or it happens more if I react. Sometimes it’s in a temper and other times she does it just because she thinks it’s funny… usually the back of her head on her cot xx
My little one hits his head and face, it seems to be when he’s tired or frustrated. I’ve been wondering about this too