Is baby supposed to be sitting at 5 and a half month? Every time I got for monthly check up he's always behind like in rolling over and picking head up those kinda milestones?
my daughter holds her head up and can sit assisted quite well she isn't quite 6 months.... she hasn't started rolling over yet either, she rolled from her back to her front 1 time and hasn't done it since.... I know they say babies should reach certain milestones at certain times but I feel some reach different ones first, ahead of when they should, then do the others later after they "should"
I agree babies do it on their time. as long as he's making progress I wouldn't worry too much