The size of the gestational sac at 40 days determines the gender of the baby

After pregnancy, a gestational sac will appear before the fetus is formed. The gestational sac will gradually become a fetus after continuous development. The size of the gestational sac is different at different times. We know that the country does not allow easy checking of gender after pregnancy. Some people will judge the gender of the fetus based on the size of the gestational sac. So, how do you determine the gender of a baby based on the size of the gestational sac at 40 days? Let’s take a look below.

The size of the gestational sac cannot be used to determine whether it is a boy or a girl. This method has basically no scientific basis, and we don't have to believe it. Generally, the gender of the fetus can be determined around three months into the pregnancy.

How to Scientifically Identify the Gender of the Fetus

1. Ultrasound scan: Ultrasound is a type of sound wave. Reports so far have shown that it has no adverse effects on the fetus, so it is very commonly used in the obstetrics and gynecology community. When using ultrasound to diagnose the sex of a fetus, the accuracy for a boy can reach over 95%, while the reliability for a girl is only about 85%. Moreover, the accuracy is directly related to the experience of the ultrasound technician or doctor.

2. Amniocentesis: Amniocentesis is mainly used to diagnose whether the fetus has chromosomal or neural tube defects, and is usually performed between 16 and 20 weeks of pregnancy. Since the chromosomes of the fetus can be known, the sex of the fetus can also be known. The accuracy is 99%, but there is a 1% chance of miscarriage. Therefore, the medical community does not recommend performing amniocentesis or drawing umbilical cord blood just to predict the sex of the fetus.

3. Chorionic villus sampling: also known as "chorionic villus sampling", is usually performed between 11 and 14 weeks of pregnancy. The main purpose is the same as amniocentesis, which is to diagnose whether the chromosomes of the fetus are normal, but some people also use it to diagnose the gender of the fetus. The accuracy rate can reach 98%. Although chorionic villus sampling can determine the sex of the fetus as early as 11 weeks of pregnancy, it may cause miscarriage (3% to 5%) and may also harm the fetus, causing defects in its hands and feet. Therefore, it is best not to undergo this test just to find out the sex of the fetus.

4. DNA blood test: Genetic engineering technology can be used to take the mother's blood to determine the sex of the fetus. It can be done after 8 weeks of pregnancy and has no effect on either the pregnant woman or the fetus. This technology is already very mature both abroad and in Hong Kong. It is currently the earliest, fastest and safest method to identify the sex of the fetus. Because sampling is simple and convenient, has no effect on either the mother or the fetus, and has a high accuracy rate of up to 99.5%, it has become a hot topic among modern people.