The weight of the fetus in 28 weeks of pregnancy is about 1 kg and the length is about 20-25 cm, as long as it is within this range is relatively normal, the size of the fetus weight and nutrition supply and fetal growth and development have a certain relationship. If the pregnant woman’s health is poor during pregnancy and she is often malnourished and anemic, it may affect the weight of the fetus, resulting in fetal growth retardation, small fetus and other conditions. If the nutrition is better absorbed during pregnancy and there is no anemia or other disease reaction, the fetus will develop relatively well and the weight will be close to normal. It is recommended that pregnant women pay more attention to rest during pregnancy, take appropriate nutrients, do a good job of diet and maintain a balanced nutrition, which is beneficial to the growth and development of the fetus.