Boys and girls born in gestational sac have long known: look at gestational sac B-ultrasound. Boys and girls have long known that they can look at the B-ultrasound of gestational sac:

1. First of all, the data should not exceed 8 weeks, and more than 40 days is most appropriate. Then there must be three data. Without three data, you can't judge, because every B-ultrasound doctor has a different orientation towards the gestational sac.

2, there are three data, which is the best judgment. The two data are almost the same, and the third data is twice as much as the first two. Must be a son. If it is decreasing data, it is a daughter.

The size of the gestational sac depends on the sex of the fetus:

It is rumored that if the length and width of the gestational sac are more than doubled, then a baby boy is more likely. If the length and width are equal, or the difference is not big, it is likely to be a female baby. Some mothers checked the B-ultrasound data of pregnancy that year to verify. For example, in the eighth week of pregnancy, the gestational sac size is 16mm× 17mm, and a little princess is born.

The shape of the gestational sac and the sex of the fetus;

Some people think that the shape of the gestational sac can tell whether the fetus is male or female. Generally speaking, if the gestational sac is shaped like eggplant, or it is very long, it is more likely to be pregnant with a male baby; And if the gestational sac is oval or round, it is likely to be a female baby.

[Boys and girls born on 20 17 knew to recommend several commonly used methods for predicting fetal sex]

Boys and girls born in gestational sacs have long known that looking at gestational sac data (w stands for weeks, d stands for days) and looking at the sex of the fetus is for reference only:

5W+6D BC data: gestational sac 25mm* 1 1mm is a boy.

6W+4D BC data: gestational sac 20* 17* 17mm is a girl.

BC data of 7W+ 1D: gestational sac 29* 19mm is a boy.

BC data of 7w+ 1D: gestational sac 35*27 mm is a girl.

BC data of 7w+ 1D: gestational sac 32*20mm is a girl.

8W BC data: gestational sac 4 1*28mm is a girl.

8W+4D BC data: gestational sac 36* 16mm, a boy.

8W+6D BC data: gestational sac 26* 18mm is a boy.

9W+4D BC data: 46.6*30.2mm gestational sac is a girl.

9W+6D BC data: gestational sac 56*24mm is a boy.

[The most accurate boys and girls have long known that one-dimensional and four-dimensional ultrasound can see the sex of the fetus]

Who decided to have boys and girls?

The birth of a boy and a girl is determined by a pair of sex chromosomes in a fertilized egg.

Specific analysis:

Every cell of human body (including germ cells) has 23 pairs of chromosomes carrying genetic material, of which 22 pairs are autosomes, which determine all genetic information except sex, and 1 pair is sex chromosome, which determines the sex of fetus.

Autosomal men and women are the same, and there is no gender difference. Sex chromosomes are different. The male 1 sex chromosome consists of X chromosome and Y chromosome (the male genome becomes 22+XY), while the female 1 sex chromosome is X chromosome (the female genome becomes 22+XX).

Half of the 23 pairs of chromosomes come from the father and the other half from the mother.

Human cells are propagated by meiosis, that is, 1 cell is divided into two, two cells are divided into four, and so on. In the process of immature germ cells developing into mature germ cells, the chromosomes in the cells undergo a meiosis, that is, the mature * * * or egg cells only contain 23 chromosomes, which is half of the original, of which 22 are autosomes, and 1 is the sex chromosome. The male sex chromosome 1 is XY, so the * * * after division is mature, one with X sex chromosome is called X ***, and the other with Y sex chromosome is called Y ***.

The female sex chromosome 1 is XX, so all the eggs after division and maturation contain 1 sex chromosome. So men have two kinds of * * * and women only have 1 kind of eggs. So having boys and girls depends on the type of male cells.

[Fetal sex calculation formula recommends the most accurate calculation formula for boys and girls born on 20 17]

Judging boys and girls, boys

1, early pregnancy (that is, the first three months of pregnancy), no morning sickness.

2, the baby's heart rate is less than 140 minutes.

The overall feeling of the body, such as mental state, is better than before.

4. The areola is relatively dark.

5, abdomen, chest and other front parts of the body, weight gain will be more obvious.

6. A bulging belly looks like a full, tight and round basketball.

girl

1, at the beginning of pregnancy, you will encounter morning sickness.

2, the hair will appear red.

3. * * * has increased significantly; The left * * * is bigger than the right * * *

4. The beating frequency of fetal heart should be at least140min.

5. The waist, buttocks and buttocks are getting fatter and fatter.

6, the bigger the belly, like a big watermelon, it doesn't look as round as a ball.