The Standardized Pregnancy Weight Gain Chart is a recommendation for weight gain during pregnancy based on different body mass indexes. Weight gain during pregnancy increases gradually with each week of pregnancy and varies for each pregnant woman depending on individual differences. 1. low pre-pregnancy weight (BMI <18.5): total weight gain during pregnancy ranges from 12.5 to 18 kg, with an average of 0.51 (0.44-0.58) kg per week in mid- and late pregnancy. 2. normal weight before pregnancy (BMI 18.5-24.9): total weight gain during pregnancy ranges from 11.5 to 16 kg, with an average weekly gain of 0.42 (0.35-0.50) kg in mid- and late-pregnancy. 3. pre-pregnancy overweight (BMI 25.0-29.9): total weight gain during pregnancy ranged from 7 to 11.5 kg, with an average weekly gain of 0.28 (0.23-0.33) kg in mid- and late-pregnancy. 4. Pre-pregnancy weight is obese (BMI ≥ 30): total weight gain during pregnancy ranges from 5 to 9 kilograms, with an average weekly gain of 0.22 (00.17-0.27) kilograms in mid- and late-pregnancy. Pregnant women need to eat more food rich in protein during pregnancy, such as eggs, lean pork, soy products, milk and so on. It is also necessary to properly supplement shrimp, fish, pork liver, oatmeal, walnuts, peanuts and other foods, eat more fresh vegetables and fruits, to ensure that the intake of food nutritional balance, to avoid a single nutrition. It is recommended that pregnant women should ensure that their weight during pregnancy is within the normal standard. If pregnant women have less or too much weight gain, it is recommended that they should seek medical advice in time, and under the guidance of the doctor, improve the relevant examinations and take appropriate treatment measures.