How big is the fetus at 8 weeks

Generally, 4 weeks is regarded as a gestational age, that is, one month of pregnancy, which is used to describe the characteristics of test tube embryo and baby development. At 8 weeks of pregnancy, that is, two months of pregnancy, the test tube embryo has already taken on the appearance of a human being. The head of the fetus accounts for about half of the entire embryo. The eyes, ears, mouth, fingers and toes of the fetus can be identified. The internal organs of the fetus have begun to divide and develop, and the heart has been formed. At 12 weeks into the pregnancy, which is the third month, the fetus is about 9cm long, with a head-to-hip diameter of 6-7cm. The sex of the reproductive organs can be initially identified, and the fetus's limbs can move. Babies born after 24 weeks of gestation may survive, but their survival rate is variable. After 28 weeks of pregnancy, the survival rate gradually increases, and 37-42 weeks is considered a full-term baby.

Strictly speaking, the fetus cannot be called a baby at 8 weeks of pregnancy, it just belongs to the test tube embryo stage. At 8 weeks of pregnancy, the test tube embryo is about 16mm long and has begun to take on a human shape. The size of the head accounts for nearly half of the entire test tube embryo. The eyes, ears, nose, mouth, fingers and toes can be distinguished. Each organ of the human body has been divided and developed, and the heart has already been formed.

This stage is the critical period of embryonic development, which is easily affected by various internal and external factors and causes deformities. Therefore, at this time, you should try to avoid contact with radioactive substances and compounds, avoid going to crowded places where air is not circulating, so as to avoid infection with fever, cold and other diseases, and avoid unnecessary use of drugs. If you need to take medicine due to a physical condition, you must consult a doctor or physician to choose medicines that are effective for the symptoms and relatively safe for fetal development.

For women with very regular menstrual cycles, usually at 8 weeks of pregnancy, the crown-rump diameter of the fetus is about 1.5 cm, and the gestational sac is more than 6 cm. Because the crown-rump diameter of the fetus can be clearly seen at this time, it is not necessarily necessary to professionally and accurately measure the size and shape of the gestational sac. For most women, hCG hormone will reach its peak value when they are 8-10 weeks pregnant, so there is no need to test hCG hormone at this time. You can just wait until around 12 weeks to create a card and do a comprehensive examination.