The appearance of the upper body sooner or later has nothing to do with the gender of the fetus. The gender of the fetus is determined by its chromosomal makeup. In human germ cells, there are 23 pairs or 46 chromosomes, of which 22 pairs are autosomes and 1 pair is sex chromosomes. Female sex chromosomes are XX; male sex chromosomes are XY. When the sperm carrying the X chromosome combines with the egg, the result is a girl;

When the sperm carrying the Y chromosome combines with the egg, the result is a boy. The number of sperm containing X and Y chromosomes is roughly equal, so there is a 50% probability of the gender of the fetus. You should pay more attention to the health of the fetus and do not worry too much about the gender of the fetus.

Extended information:

The physiological development with sexual maturity as the core gives teenagers social and psychological characteristics that are obviously different from children. Individuals rely on adults during childhood, and adults restrict and determine the main content and aspects of children's lives and activities; children are not responsible for their own actions. As age increases, the scope of life and the content of activities gradually become more complex, giving teenagers different characteristics from children.

Having not become a fully responsible person, you are not necessarily criminally responsible for all your actions. It can be seen that this transitional status between children and adults makes teenagers what is called marginalized people in sociology. The uncertainty of status and the uncertainty of the requirements put forward by society have caused many problems. Special mental health issues.