Postpartum obesity is a problem encountered by many women. With the baby crying, pregnant women began to worry about their bloated figure. How to meet the baby's nutritional needs in breastfeeding, how to lose excess fat and restore a beautiful figure has become the dream of contemporary women. Women from pregnancy to postpartum are divided into pregnancy, puerperium (usually referred to as "confinement") and lactation. Because of family planning, the national policy calls for "just having one child", and most women only have one chance to have children in their lifetime. Therefore, it is regarded as the "top priority" by society and family, and pregnant women are given special care in spirit, life, work and material enjoyment, but too much life care often creates opportunities for pregnant women to gain weight. The nutritional status of pregnant women is related to the choice and intake of food, which will have an impact on the intelligence, physique and physical development of babies. Therefore, pregnant women are not suitable for losing weight, so they should monitor their nutrition with the help of doctors and maintain an appropriate weight gain rate. According to the BM 1 (body mass index) value of pregnant women, the most suitable weight gain range for pregnant women is body mass index.