Hi..I feel due date is best used as a guide on ur baby's development n e percentage of giving birth on e exact due date is pretty low unless its a planned c-sect. My #1 was induced at 34wk n delivered @ 2.2kg due to a leaking water bag. My #2 weighed 3.2kg at 38wk, #3 was 'overdue' at 40wk 5days weighing 3.01kg n #4 weighed 2.9kg at 39wk 6days. From my experience, every pregnancy n delivery is never e same. In fact i feel like a new mum each time..haha..