It is normal to gain 30-40 kg during pregnancy, but the baby may gain 30 kg more after birth than before pregnancy, because the child is usually only 7-8 kg at birth, plus amniotic fluid, at most 10 kg. When I just gave birth to a baby, I felt there was another one in my stomach. In fact, I don't feel like I have a baby, because my stomach is still bulging, because there is a lot of water in my stomach, which will usually be discharged in a few days.
If we want breast milk to lose weight, it's actually not that difficult. You can do moderate exercise during breastfeeding, and you can lose weight by breastfeeding yourself. If there is enough breast milk, there is absolutely no need to eat big fish and meat, and the diet should be as light as possible. Just let the baby's nutritional needs be met. Don't drink greasy soup every day, because these oils will grow on yourself. Try to eat less and eat more meals. If there is enough breast milk, there is absolutely no need to eat so much. This time is actually the easiest time to lose weight, because what whales eat will be absorbed by their babies, plus moderate exercise will get twice the result with half the effort, but you can't do high-intensity exercise during lactation because it will deteriorate breast milk.
In fact, I think the most important thing to lose weight is to keep your mouth shut and open your legs. Don't think that you can't exercise or go on a diet during lactation. Eating too well will only make you fat. In fact, the baby doesn't need so much nutrition at all. If you can't lose weight at this time, it will be even harder after breastfeeding. Losing weight is a hard and long process, and the most important thing is persistence.