When you are pregnant, you may receive a lot of unsolicited opinions about your body and the baby. One of the most popular topics to discuss is whether the baby you are carrying is a boy or a girl.

The formation of the fetus's gender occurs at the moment the egg and sperm meet. According to the principle: an egg carrying the X chromosome meets a sperm carrying the X chromosome, forming an XX zygote – female gender. Conversely, an egg carrying the X chromosome meets a sperm carrying the Y chromosome, forming an XY zygote – male gender.