I would think it all depended on the individual baby. Some babies need to bake longer than others which is why "full term" tends to go from 37-42ish weeks. For me I'm sure that my bub would be fine at 37 weeks as both my previous babies made their entrance naturally at 37 1/2 weeks and both rather large (8lb10oz and 8lb3oz) and have had no gestation related issues. But then you hear of others going "over due" and still having small babies that require a little help to adjust to life on the outside.