Is It Normal for the Sac and Embryo to Develop Asynchronously?

The asynchronous growth of gestational sac and embryo bud is generally considered normal, indicating a relatively slow growth. Don't worry too much about it. Strengthen your health, pay attention to your diet, and go to the hospital for follow-up examinations in time. Generally speaking, if there is no stop in growth, there should be no major issues. Additionally, it should be noted that B-ultrasound detection of gestational sac and embryo bud may sometimes have errors.

This is generally not a concern. It may be due to relatively slow growth. You can strengthen your nutrition and go for a follow-up examination. As long as there is no stop in growth, there is no need to worry too much. The size measured by B-ultrasound may sometimes have errors due to differences in different cross-sections. Normal prenatal checkups are sufficient.

After the sperm and egg combine to form a fertilized egg, the implanted fertilized egg gradually splits into a multicellular gestational sac. After more than 30 days of pregnancy, the primitive cells differentiate and gradually form an embryo bud. The embryo bud further develops into a fetal heart, which is the process of fetal formation. The period from the third week of pregnancy to the first month of pregnancy is called the embryo bud stage, during which the growth rate of the new life is the fastest in its entire life. At the end of the second week of pregnancy, the sperm and egg combine, and after about 4 days of fertilization, the fertilized egg, which has split into a cell mass, travels along the fallopian tube to the uterus. In the third week, the cell mass sheds its outer membrane, preparing for implantation. In the fourth week, the blastocyst has firmly implanted in the uterus. During this period, the prototypes of the fetal nervous system and circulatory organs have almost appeared, and the liver begins to develop significantly from this period. The prototypes of the eyes and nose have not yet been formed, but the prototypes of the mouth and chin are already visible. The umbilical cord connected to the mother also begins to develop from this period.