Ab exercises that will flatten my abs quickly?

I had my second baby 6 mths ago and my stomach looks horrible. I need an ab routine that will help slim them down quickly since summer is almost here. I’m back down to my normal weight but none of my pants fit cause of my pudgy tummy. I use to do hit the spot abs with Denise Austin but I can’t find my video. HELP-I feel like I look pregnant still!!