Moderate exercise to lose weight during breastfeeding will not affect milk production, but strenuous exercise will have an effect on milk production, and there will be a decrease in milk production. Moderate exercise to lose weight during breastfeeding can burn body fat and keep your body healthy. Strenuous exercise will consume a lot of energy, which will have an effect on the secretion of milk, and will lead to a decrease in the amount of milk due to insufficient raw materials for milk production. In addition, the body will produce a large amount of lactic acid after strenuous exercise, secretion of milk, so that the taste of milk changes, which is unfavorable to the baby. Exercise to lose weight during breastfeeding should be in moderation, you can choose walking, jogging, yoga and other ways to avoid strenuous exercise. Women should eat more food rich in protein during breastfeeding, such as eggs, pork lean meat, soy products, milk and so on. It is also necessary to properly supplement shrimp, fish, pork liver, oats, walnuts, peanuts and other foods, eat more fresh vegetables and fruits, to ensure that the intake of food nutritionally balanced, to avoid a single nutrition. If there is a significant change in the amount of milk after exercise, it is recommended to go to the hospital in time.