Need to Lose Weight

Okay has anyone ever done the South Beach Diet? Well I'm going to try it i tried once and it was around new years and i went two days doing it and on new years i screwed it up and ate things i wasn't supposed to now i can't do it. But I really need to lose the weight so i'm going to try again. Its so hard. For those that have had kids and are skinny how did you lose your baby weight? I lost it with my first but it seems like i can't loose it after my second. I want to lose weight but i can't go to the gym or anything really cause of my kids. If you have any ideas let me know. Thanks!!!