Hi Myth
I've just pm'd you an article you might find interesting. I had the same problem after the birth of my son and of my daughter - it isn't easy to deal with but there are solutions. You might also want to talk to your doctor or midwife, they can also recommend good exercises. I've added a link below to the article.
http://pregnancyandbaby.com/pregnancy/baby/After-baby--Dealing-with-a-flabby-belly-269.htm