First, the speculation of men and women in Qing Dynasty
Watches for boys and girls born in Qing Dynasty were invented by ancient people in China and buried under an ancient tomb with a history of more than 700 years. Due to the long history, it is difficult to verify the authenticity of the source of the Qing palace watch. The ancients calculated translation according to five lines of gossip of Yin and Yang, plus time calculation. A doctor once used 65438+ 10 months, April and September in a certain year, totaling about 1500 parturients, converted the maternal's birthday age and pregnancy date into the lunar calendar with a perpetual calendar, deducted three days at the beginning and end of each month, and then compared the sex of the fetus one by one. According to the formula and prediction table, "the probability of having a boy and a girl is similar to that of random guess." So there is no scientific basis for this calculation method.
Second, the urine test of pregnant women can measure the sex of the fetus.
"After six weeks of pregnancy, as long as a cup of morning urine and a test paper are used, it can be detected within five minutes that the morning urine of boys turns blue and the girls turn pink." Starting this year, we found a new product on the Internet to detect the baby's sex, claiming that it is easy to detect whether the fetus is male or female through the morning urine of pregnant women. This product claims to be "male or female can be seen by urine test". "You don't need to do B-ultrasound, and you don't need to look at indicators. You can test your baby's sex through urine test, and the accuracy is not low. I searched and found that there are two main types of such products:
One is the "test cup", which is a covered cup with green and yellow stripes on the bottom. Expectant mothers only need to put the first urine in the morning into the test cup, let it stand horizontally for 5 minutes, and then compare the urine with the color bar. If it is close to green, it is a boy; if it is close to yellow, it is a girl.
The other is "test card", which is somewhat similar to PH test paper. Pregnant women only need to drop morning urine on the test card and observe the color displayed on the test card. If it is close to blue, it is a boy; if it is close to pink, it is a girl.
In this regard, we specifically consulted experts in obstetrics and gynecology. "It is definitely not reliable to use the morning urine of pregnant women to measure the sex of the fetus." Experts say that urine test can detect HCG level, that is, "chorionic gonadotropin". But this is not a sex hormone, and its level has nothing to do with the baby's sex. HCG can only measure whether the baby is developing normally. There is no scientific basis for measuring baby's sex through urine.
Third, judge the sex of the fetus according to the different pregnancy symptoms.
1, look at the shape of the belly
It is said that boys are born with sharp bellies. If it is round and looks like a basketball, it may be a girl. This estimation is the most commonly used guessing method of ancestors. But the accuracy is not high!
2. Look at the change of taste
It is said that girls who are sour and spicy are naturally pregnant boys who like to eat sour and pregnant girls who like to eat spicy food. However, this article has been criticized by many people who have been there.
3. Look at the changes in your body
Pregnant mothers are usually boys when they are not very fat and girls when they are obviously fat. From the back, if the pregnant woman's waist is wider, it is more likely to have a daughter, and the pregnant woman with a male treasure has a thinner waist. This folk method is said to be quite accurate.
4. Look at the shape of the navel
Not reliable. If the navel protrudes, it may be a boy. If you are pregnant with a girl, the navel is generally flat or even concave. This is not reliable!
5. Look at the changes in the appearance of pregnant mothers.
It is said that if you are pregnant with a boy, you will get spots and acne on your face. With a girl, she hasn't changed much, even her skin has become smooth. It is said that it is because of the hesitation of giving birth to boys and girls that the levels of male and female hormones in pregnant women are different!
6. Look at the location of pregnancy line.
Pregnancy line is the dark brown line above the navel. If it is thin and long, up to the chest, between the breasts, it must be a male treasure. Those who can't grow breasts are all female treasures. This article has been highly praised by many netizens, saying that compared with the experiences of many people who have experienced it, it is said that the accuracy is still very high.
7. Look at the B-ultrasound list
Looking at the data, if the length and width are more than doubled, it is more likely to be a boy baby. Baby girls are more likely to be equal in length and width. Second, look at the shape of the gestational sac, such as eggplant or strip, which is more likely to be a male baby, and a round one is more likely to be a female baby. This is not reliable.
8. Listen to the fetal heart rate
If the fetal heart rate is lower than 140 beats/min, the fetus is a boy. If it is higher than 140 times/minute, or even often higher than 150 times/minute, it is very likely that it is a girl. This is not reliable!
There is no scientific basis for the above, but some methods summarized by everyone according to experience. At present, there is scientific evidence that if the mother is in an acidic environment, the probability of having a daughter is higher, and the probability of having a son in an alkaline environment is higher.
Fourth, more reliable testing methods for men and women.
There are four kinds: amniocentesis, villus sampling, DNA blood identification and B-ultrasound, but sex identification is forbidden in China.
1, amniocentesis is an invasive sex identification method, with 1%-3% risk of abortion, fetal malformation and infection. The accuracy rate can reach about 95%. Amniotic fluid is a special fluid that reflects various fetal functions and some diseases. Amniotic fluid contains cells detached from fetal skin, respiratory tract and urethra. The medical community does not approve of amniocentesis just to detect the sex of the fetus: amniocentesis uses a long needle to suck amniotic fluid from the amniotic cavity through the abdominal wall of the pregnant woman, thus detecting the condition of the fetus.
2.DNA blood identification is to extract maternal peripheral blood by genetic engineering technology for judgment. There is no risk to the fetus and mother. The report issued by an authoritative laboratory in Hong Kong has an accuracy rate of over 99.4%, and the sex is inferred through chromosomes. It can be carried out after 7 weeks of pregnancy, when the embryo length reaches 10mm, and the results will be produced in about 1-2 days.
3. villus sampling is also called villus sampling, that is, under the guidance of ultrasound, a slender needle enters the amniotic cavity through the abdomen, uterine wall and amniotic membrane of pregnant women, and a small amount (about 20CC) of amniotic fluid is extracted. The accuracy can reach 100%, and the results can be obtained in 2 days. Although the sex of the fetus can be judged by villus sampling around 10 week of pregnancy, it may cause abortion (1% may cause harm to the fetus).
4.b-ultrasound identification of fetal sex requires pregnant women to be pregnant for more than 19 weeks. But 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 can't reach 100%, but the safety is the highest.