Backtracking the date, if the child was actually born on 12/13 or 12/14, actually puts conception after the party, but not real far beyond it - about a week. Further, third, fourth and so on births tend to come a little early, which would move the date forward, not back to the 13th-14th of March.
Duke admits 469, sees 20% decline in early applications
Officials say lacrosse, national admissions trends had likely effect
http://www.dukechronicle.com/media/storage/paper884/news/2006/12/11/News/Duke-Admits.469.Sees.20.Decline.In.Early.Applications-2598581.shtml?norewrite200612150518&sourcedomain=www.dukechronicle.com