Well, I had one kid and my abs are better now than they ever were, but that is because I finally started Cathe back in March 05. I think the magic combo for me was (and is) cleaner diet, a lot more heavy weight work mixed in with endurance and circuits, weighted ab work & a lot of functional fitness type work.
I agree not to be discouraged, having kids takes a huge toll on your body and you need to give yourself ample time. You will get there!
Debbie
Peter: Oh my god, Brian, there's a message in my Alphabits. It says, 'Oooooo.'
Brian: Peter, those are Cheerios.
--Family Guy