I gained 25 pounds with first pregnancy (age 36) and 30 pounds with second pregnancy (age 38). Lost the weight in 12 weeks with both pregnancies. I was back to exercise at 5-6 weeks and ate on the South Beach diet. Both kids were breastfed for a year and a half. No problems with milk supply when losing weight but likely because all the food I was eating was nutrient dense (nuts, greens, eggs, berries, lean meat, veggies).