Each fetus is different, and the month in which the fetus is born is different, so the standardized data is also different. Normally, a fetus weighs about 20 grams and is about 9 centimeters long in the third month of pregnancy. In the 6th month of pregnancy, the baby weighs about 700 grams and is about 30 centimeters long. As the fetus grows and develops, it weighs about 1.5 kilograms and is about 40 centimeters long at about 8 months of pregnancy, and weighs about 3 kilograms and is about 50 centimeters long at about 10 months of pregnancy. A thorough prenatal checkup not only determines the health of the fetus, but also the health of the pregnant woman herself. Every pregnant woman should pay attention to the prenatal checkups during pregnancy, and actively listen to the professional doctor’s advice to do a good job of comprehensive care and health care. If the development of the fetus is normal, there is no need to be overly nervous, and usually pay attention to rest. If the fetus is too small or too large, it is recommended to actively consult a doctor for symptomatic treatment.