Dm keeps saying ds2 is very "baby baby" - as in he's slow to develop. My DBs little girl is seven weeks older (6.5 months) and is rolling and sitting. Ds2 is five months now and was three weeks early.
I think he's fine but DM keeps saying he's very young. DN is very sociable, chatty and animated. Ds2 will smile and coo but is more serious in nature.
I don't think I'm worried but mum keeps saying he acts so young