How big should the embryo be at 7 weeks of pregnancy

Women will do various prenatal checkups during pregnancy, targeting different items with different purposes, which are mainly determined according to the development of the fetus. For example, in the first three months of pregnancy, that is, in the early stages of pregnancy, the key thing to check is the embryo and fetal heart rate. What should the fetal heart rate be at seven weeks of pregnancy?

What should the fetal heart rate be at the seventh week of pregnancy?

Generally, the embryo and fetal heart can be seen during ultrasound examination at 6-7 weeks of pregnancy. The size of the embryo bud and fetal heart is around 0.5-1 cm.

Pregnancy is a complicated process, from the initial embryo implantation to the gestational sac, fetal bud, fetal heartbeat, and the birth of the fetus. There are different changes in each week of pregnancy. Judging the growth size of the fetus through B-ultrasound examination is a relatively accurate method. Expectant mothers can observe the fetus through standard values, from the initial development to the whole process of maturity.

4 weeks: The fetus is only 0.2 cm. The amniotic cavity is formed just after the sperm and egg combine and the embryo implants, and its volume is not large. Ultrasound cannot clearly show signs of pregnancy.

5 weeks: The fetus grows to 0.4 cm and enters the test tube embryo stage. The amniotic cavity expands, initial cardiovascular and cerebrovascular diseases appear, and heartbeats will occur. Ultrasound examination can reveal a small gestational sac, which occupies less than 1/4 of the uterine cavity, or the fetal bud and fetal heartbeat can be seen from it.

6 weeks: The baby grows to 0.85 cm, the baby's head, brain alveoli, frontal organs, respiratory, digestive, neural and other organs are divided, the fetal sac is clearly visible on B-ultrasound examination, and the fetal bud, fetal heart rate and fetal heart rate are seen.

7 weeks: The fetus grows to 1.33 cm. The test tube embryo has a human prototype. The body segments have all been divided, the limbs have separated, and the various systems are further developing. Ultrasound examination clearly shows the embryo, fetal heart and fetal heart rate, and the gestational sac occupies about 1/3 of the uterine cavity.

8 weeks: The fetus grows to 1.66 cm, the fetal shape is fixed, the fetal head, body and limbs can be separated, and the fetal head is larger than the body. B-ultrasound examination shows that the gestational sac occupies about 1/2 of the uterine cavity, the shape of the fetus and the fetal movement are clearly visible, and the yolk sac can be seen.

9 weeks: The fetus grows to 2.15 cm, the fetal head is larger than the embryo, the main manifestations of each part are clearer, the head begins to thicken, and the embryo begins to grow. B-ultrasound examination shows that the gestational sac basically fills the uterine cavity, the outline of the fetus is clearer, and the embryo has begun to appear.

10 weeks: The fetus grows to 2.83 cm, the fetus's internal organs have been formed, and the embryonic prototype is formed. B-ultrasound examination showed that the gestational sac had begun to shrink, and the crescent-shaped embryo was visible, and the fetus was active in the amniotic fluid of the pregnant woman.

11 weeks: The fetus grows to 3.62 cm, the fetus's internal organs continue to grow and develop, and the embryo grows and develops. B-ultrasound examination showed that the gestational sac had completely disappeared and the embryo was clearly visible.

12 weeks: The fetus grows to 4.58 cm and the reproductive organs are basically grown and developed.

Reasons for no fetal heartbeat during pregnancy

Generally, the embryonic bud and fetal heart rate can be seen around 40 days of pregnancy, and the fetal heartbeat can be seen around 50 days of pregnancy. If there is no embryonic bud and fetal heart rate during pregnancy, it is considered to be incomplete development. The main reasons are as follows.

1. Chromosomal abnormality. Whether it is sperm or egg, as long as the sex chromosomes carrying genetic material are abnormal, even if the sperm and egg combine, the fetus will not develop normally.

2. Contact with harmful substances. Hazardous substances include harmful compounds, inferior home decoration materials, etc. If pregnant women touch it, it will affect the growth and development of the embryo bud and fetal heart.

3. Exposure to direct radiation or a large amount of electromagnetic radiation. Pregnant mothers are exposed to X-rays without knowing it, which causes a lot of direct radiation and may affect the growth and development of the embryo and fetal heart.

4. Taking medicines that affect the growth and development of the embryo and fetal heart. Some early pregnancy reactions of pregnant women are very similar to cold symptoms, and their menstrual cycles are not very regular. Therefore, many people accidentally take cold remedies without knowing they are pregnant. In addition, there are some patients with special diseases who, while taking medications for a long time, have accidental pregnancy when they are not well prepared for pregnancy. This is also a major factor affecting the hypoplasia of the fetal bud and fetal heart.

5. Smoking or drinking. Smoking and drinking not only damage women's reproductive ability, but also affect sperm quality, causing incomplete development of the embryo and fetal heart, and ultimately causing the risk of fetal malformations.