If a baby is born on Nov 30 2008 when was he conceived?

Childbirth usually occurs about 38 weeks after conception. So 38 weeks before November 30, 2008 would be Sunday, March 9, 2008. The key is that it "usually occurs". A baby could easily be born a couple weeks before or after 38 weeks, so the actual conception date could vary by a couple weeks either way.