I'm 5'5", small frame and became overweight pretty quickly after my second child. Now, I'm losing weight. I'm within 10 pounds of reaching my goal, but I'm wondering... can sit-ups and crunches help with the flabby baby-area of the tummy? Some have told me that a post-pregnant tummy can never be fully repaired. This is somewhat discouraging I want to have a flat tummy again but wondering if this can be achieved.