My 6mo old very very rarely laughs. We've gotten her like 5x total by tickling/etc. no belly laughs or purposeful laughs. It seems to be a 6M milestone that she is just not doing. She does smile and make eye contact but definitely isn't super smiley and doesn't give those away easy at all either. I am in a complete anxiety spiral that something is wrong. Anyone have a baby like this and what are they like now?