I have been wondering this and I don't understand it. Why does my baby need to "catch up" on his growth?? I understand he's really 5 months old (2 months old adjusted) but he is exactly where he should be. He's not supposed to be like a 5 month old, so I don't know why he needs to "catch up" on those 3 months he lost not being in the womb? He's not "behind," he was just born at 26 weeks instead of 40 weeks. According to the time he was conceived, and his due date, he's exactly where he should be so I'm so confused as to why he needs to "catch up"??? Any insight?