How big should the embryo be at eight weeks?

When a mature fertilized egg implants in the mother's body, the mother will pay special attention to this little life. Although the embryo is still a relatively small bud in the mother's body, its healthy growth and development is always a concern of the mother. Regular check-ups are what many pregnant mothers do. There are different changes in the different stages of fetal development, and there are certain growth data in different periods.

How big should the embryo be at eight weeks ?

How big is the embryo at eight weeks of pregnancy?

The embryonic bud is the name of a certain period in the development of the fetus. The embryonic bud period is generally called the 3rd week to 14th week of pregnancy. The embryonic bud is actually an early embryo. At 8 weeks of pregnancy, the fetus grows to 1.66 cm and its shape is determined. The head, body and limbs can be distinguished, and the head is larger than the trunk. B-ultrasound shows that the gestational sac occupies about 1/2 of the uterine cavity, the fetal shape and fetal movement are clearly visible, and the yolk sac can be seen. Therefore, the embryo bud at 8 weeks of pregnancy is about 1.66cm long.

What if there is no embryo at 8 weeks of pregnancy?

1. Embryonic factors:

Abnormalities in the chromosomes of the genetic material carried by sperm and eggs lead to abnormal development of the embryo.

2. External factors:

If pregnant women are exposed to harmful substances in the early stages of pregnancy, such as toxic chemicals, inferior decoration materials, radiation or large amounts of electromagnetic radiation, the development of the fetal bud will also be affected.

3. Maternal factors:

If a pregnant woman is infected with rubella, cytomegalovirus, etc. in the early stages of pregnancy, the pathogens will be indirectly transmitted to the fetus, which can cause fetal malformations.

The size of the embryo at each gestational week

4 weeks:

The fetus is only 0.2 cm. The amniotic cavity is formed just after the fertilized egg has implanted and its volume is very small. Ultrasound cannot show clear signs of pregnancy.

5 weeks:

When the fetus grows to 0.4 cm, it enters the embryonic period, the amniotic cavity expands, and primitive cardiovascular system appears, which may beat. B-ultrasound can show a small gestational sac, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen.

6 weeks:

When the fetus grows to 0.85 cm, the head, brain alveoli, facial organs, respiratory, digestive, nervous and other organs are differentiated, the fetal sac is clearly visible on B-ultrasound, and the fetal bud and fetal heartbeat are seen.

Week 7:

When the fetus grows to 1.33 cm, the embryo already has the rudiments of a human being, with all body segments fully differentiated, limbs separated, and various systems further developed. B-ultrasound clearly shows the embryo and fetal heartbeat, and the gestational sac occupies about 1/3 of the uterine cavity.

8 Weeks:

When the fetus grows to 1.66 cm, its shape has been determined and the head, body and limbs can be distinguished. The head is larger than the trunk. B-ultrasound shows that the gestational sac occupies about 1/2 of the uterine cavity, the fetal shape and fetal movement are clearly visible, and the yolk sac can be seen.

Week 9:

When the fetus grows to 2.15 cm, the head is larger than the body, the various parts appear clearer, the skull begins to calcify, and the placenta begins to develop. B-ultrasound shows that the gestational sac almost fills the uterine cavity, the fetal outline is clearer, and the placenta begins to appear.

Week 10:

The fetus grows to 2.83 cm, all the fetal organs have been formed, and the embryonic form of the placenta has been formed. B-ultrasound shows that the gestational sac begins to disappear, a crescent-shaped placenta is visible, and the fetus is active in the amniotic fluid.