My first was due on 15/02 by LMP and 10/02 by dating scan. He arrived on 12/02 and was according to the paed "classically overcooked" - very long nails, dry skin etc. And this was just 1 day and 4 hours after the EDD from the dating scan!!

My second arrived at 36w+3, based on EDD from dating scan (couldn't use LMP as I still wasn't regular after DS1), and was still 6pd8 and healthy, so probably not as "early" as the EDD would suggest.