I went back down to smaller than my pre-preg size very quickly after giving birth. Even the day after I had given birth the midwives on the ward commented that my tummy was so small it didn't even look like I'd ever been pregnant. When I stopped breastfeeding I did put a little bit of weight back on but joined the gym and now do yoga and body balance 2-3 times most weeks plus some at home and only have 1-2kg to go to be at my goal of 50kg (48-50kg is my optimum weight for my small stature). I have had to work a little for it. The only thing I'm not happy about are that my hips are a different shape (wider) since having DD and it's just because the bones have moved. Can't do anything about that.