I have had the same problem. I have had only one baby , for now. But I have foud a few thing that did seem to help me.
I started drinking a lot of water, this made me feel better and gave me more energy. I was supprised because everyone always said it would, but i didnt believe it untill i tried it.
Also I try to take a walk every even if its just for 10 or 15 minutes.
I didnt think that walking was actually doing anything for me at first but the days that I didnt walk seemed to drag a little.
And last, I found a dvd called mtv's palites. This dvd is my favorite. I have NEVER been much for working out at all, and there was no way I have time or money for a gym. Every time Im doing these exercises I feel so great. some things are hard and I cant do yet and some things seem so easy and i find myself thinking , "how could this be doing anything" untill the next day. which brings me to the best part of all. You know when you do some exercises and your so sore the next day you wish you never exercised in the first place? Well, that would happen to me a lot. with this dvd I would fell like I exercised but in such a good way.
Everythng is focused on the belly and strenghtening it, but in small doses. theyll do one exercise for a minute or so and Ill feel like I cant do this, but by the end of the dvd Im like "it that it? its over already!" even after the first day I noticed how I paid attension to how I held myself more and it made me feel great.
I weighed 115 before Maxx, and was 175 while pregnant with him.
Ive been doing the dvd for about 2 months now and im already down to 149. Its not my goal. Its been gradual and not hard, in fact enjoyable.