Pregnancy is a very difficult thing, but also a very happy thing. It's amazing to feel a little life gradually growing in one's belly. Many women want to know what their baby looks like in the early stages of pregnancy. This article will introduce the range of gestational sac sizes at 6 weeks of pregnancy.
The gestational sac is the primitive placental tissue, a small embryo surrounded by amniotic membrane and vascular network. The gestational sac is the initial form of pregnancy, when the fetus has not yet formed and the fetal heart is already beating when the embryo appears. The gestational sac is also a product of ectopic pregnancy. The fertilized egg does not enter the uterus at 7 days due to inflammation, adhesions, and other factors. Usually, ectopic pregnancy will cause heavy bleeding, and the fetus cannot survive. Little BB's mother had an intrauterine pregnancy, but due to poor uterine development, the gestational sac broke through from the weak tip of the uterus and entered the abdominal cavity. The villi around the gestational sac searched for nutrients in the abdominal cavity and then supplied the fetus through the placenta.
Usually, such fetuses live in extremely harsh environments and have poor nutrition due to the lack of protection from the uterine environment. Normally, the fetus will die within two months. Pregnancy is a complex process. After fertilization, the egg enters the uterine cavity, and the embryo and its appendages rapidly grow and develop until maturity, with different changes occurring at each gestational week.
4 weeks: The fetus is only 0.2 centimeters. The fertilized egg has just completed implantation and the amniotic cavity has just formed, which is very small in volume. Ultrasound still cannot detect signs of pregnancy.
5 weeks: The fetus grows to 0.4 centimeters, enters the embryonic stage, the amniotic cavity expands, the primitive cardiovascular system appears, and there may be pulsation. 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: The fetus grows to 0.85 centimeters, and the fetal head, brain vesicles, frontal and facial organs, respiratory, digestive, nervous and other organs differentiate. The fetal sac is clearly visible on B-ultrasound, and fetal buds and heartbeat can be seen.
7 weeks: The fetus grows to 1.33 centimeters, the embryo has taken on human embryonic form, all body segments have differentiated, limbs have separated, and various systems have further developed. B-ultrasound clearly shows the fetal bud and heartbeat, with the fetal sac occupying approximately 1/3 of the uterine cavity.
8 weeks: The fetus grows to 1.66 centimeters in length, with a predetermined fetal shape that can be divided into a fetal head, body, and limbs. The fetal head is larger than the torso. Ultrasound shows that the fetal sac occupies about 1/2 of the uterine cavity, and the fetal morphology and movement are clearly visible, with the yolk sac visible.
9 weeks: The fetus grows to 2.15 centimeters in length, with the fetal head larger than the fetal body and clearer manifestations in various parts. The head begins to calcify and the placenta begins to develop. Ultrasound shows that the gestational sac almost occupies the uterine cavity, the fetal contour is clearer, and the placenta begins to appear.
10 weeks: The fetus grows to 2.83 centimeters, all organs of the fetus have formed, and the embryonic form of the placenta is formed. Ultrasound shows that the gestational sac is beginning to disappear, the crescent shaped placenta is visible, and the fetus is active in the amniotic fluid.
11 weeks: The fetus grows to 3.62 centimeters, and its various organs further develop, including the development of the placenta. Ultrasound shows complete disappearance of the gestational sac and clear visibility of the placenta.
This article provides a detailed introduction to the size of the gestational sac and the development of the fetus starting from the determination of pregnancy. As an early pregnant woman, it is best to carefully refer to the content of this article so that you can know the development of your baby at different gestational weeks. For expectant mothers, experiencing the baby's situation is a very happy thing.
