Hi K.,
I am certified to work with prenatal and post partum moms and you have JUST gotten out of the zone where we do not advise working out; As someone who has had a c-section, you should not have been working out until after 8 weeks, AND after your doc has cleared you, so don't get all bent out of shape about your belly. Like everyone else has just said, you need time to recover! If your doctor has said it is ok to workout, start doing some walking with the kids. Then depending on what you had been doing before giving birth, just gradually, as YOU feel fits, begin adding more exercises into your routine.
When I work with postpartum moms, and they had been previously working out, I start them out walking and using light to no weights working through each body part, one exercise per part. As far as abdominal work, (now i have not had a c-section) start out with just regular crunches and work from there. There are alot of youtube videos that show some great exercises. But if there is discomfort, discontinue or just try again in a day or two. Your muscles need to be reconditioned, and again, it is going to take some time. If the discomfort is too excrutiating, then by all means, please call your doctor.
Check out youtube and look up baby boot camp. I know that those girls have been certified to work with moms, and they have some great tips on exercise!! :-) --I hope its ok that I told you that, its just that I dont want you to trust all that you see online.
And always remember..listen to your body!! :-) good luck