Quoting Nicolai and Caelyn's mom:" So I'm exclusively breastfeeding....my daughter is 3 weeks old and I have already dropped 23lbs!! I'm ... [snip!] ... to keep the weight falling off? I'm walking here and there but haven't been cleared for exercise yet(Nov 7th is my appointment)"
You don't need to necessarily exercise. Breastfeeding and walking once or twice a day did it for me. Babies love fresh air too, so it's nice to get out for a walk AT LEAST once a day. And I gained 70 lbs during pregnancy!!!