When we go to the hospital for gynecological examinations, sometimes we are told the size of the egg, but what is considered large and what is considered small? In the process of planning pregnancy, the egg is a decisive factor that we cannot ignore. So, let's take a look at some relevant information about egg size together, so that we can have a more comprehensive understanding.
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 one-third 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.
