My dear daughter was born at 37 weeks but also considered small (2.43kg). She caught up with e rest by the 2nd month in terms of wt (50th percentile) but has since then fallen far behind. She's 9 months old but only 7kg. I dont dare to chk what percentile growth she's at already.... haha. BUT she's very healthy n strong. dont feel too stressed about baby's wt. If she's reaching appropriate milestones then i think there's no cause for concern.