Why do pregnant women need to undergo various prenatal check ups at different stages? The purpose is to monitor whether the various indicators of pregnant mothers and babies at different stages are at normal levels, so that if there are problems, the cause can be identified early. The gestational sac is a basic and important data. What is the normal size of the gestational sac at six weeks of pregnancy? Let's delve deeper with the editor below.
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.
By understanding the normal range of gestational sac size during different pregnancy cycles, expectant mothers can make some preliminary judgments based on their own examination data. However, it does not necessarily mean that the gestational sac must be within that range during the corresponding pregnancy cycle. There may also be special circumstances that arise, as long as the baby is growing up healthy. I hope every expectant mother can give birth to a baby smoothly.
