hello I just downloaded the app and joined this group, my son recently turned 10months this past weekend he's a preemie n is supposed to be 8 months old..he's very active,and this past week he started crawling,sitting up on his own and got his 1st 3 teeth all in one week, he was a twin but our Lil girl didn't make it..sometimes I think he's 2 babies in 1 lol