What are the methods of gender identification?

At present, B-ultrasound is a more accurate method to judge boys and girls. Although boys and girls can be detected around 18 weeks of pregnancy, when doing B-ultrasound, the baby may turn his back to the direction or cross his legs and can't see his genitals. B-ultrasound identification of fetal sex requires pregnant women to be pregnant for more than 19 weeks. However, even the most experienced imaging experts can only see the baby's sex after three and a half months of pregnancy or more, and the accuracy rate cannot reach 100%. But the security is the highest.

2.DNA blood test

DNA blood test is also the identification of maternal blood. Genetic engineering technology can determine the sex of the fetus by taking blood from the mother's vein. There is no risk to the fetus and mother. Because of the report of blood DNA laboratory, the accuracy of identification can reach 98% at present. Sex inference through chromosomes, especially for male babies, has a strong reaction. The baby will be examined after 8 weeks, and the results will be obtained in about 3 days. More importantly, this method will not have any impact on pregnant women and fetuses.

3. Amniocentesis

Amniocentesis is to take samples from amniotic fluid, usually around 18-20 weeks of pregnancy, and then analyze the baby cells in it. Generally speaking, this method is only used when the possibility of infant malformation increases, and it is only used to judge the sex of the fetus when the infant is at risk of serious genetic problems. No matter the accuracy and safety of diagnosis, it has been recognized by the medical community, but there are also risks.

4, villus biopsy

Pregnant women can have chorionic biopsy during pregnancy 10- 12 weeks. When the baby may have serious sex-related problems, chorionic biopsy is usually used to determine the sex of the fetus, such as detecting chromosomal abnormalities such as Down syndrome. Although the sex of the fetus can be judged by villus sampling around 10 week of pregnancy, it may cause abortion.

5. Ultrasonic scanning

Ultrasound is a kind of sound wave, which has no adverse effect on the fetus, but this method must be checked within 3-4 months of the baby, so the accuracy of the results is relatively high. When ultrasound is used to diagnose the sex of the fetus, the accuracy of male infants can reach over 95%, and the reliability of female infants is only about 85%.