Determining Baby's Gender: How It Works During Pregnancy

Question
Hello!
is it possible for gender of a baby to change while a mother is pregnant?!?
thank you very much indeed
estee

Answer
When the sperm meets the egg and fertilizes the egg, there is passage of chromosomal material from the egg and from the sperm. If the fetus gets an X chromosome from the mother and an X chromosome from the father, the baby will be a female. If the fetus gets an X chromosome from the mother and a Y chromosome from the father, the baby will be a male. Once the genetic material is in the fetus, it does not change. Once the baby is a male, it does not change. However, it is not noticeable on sonogram until around 20 weeks gestation. If a penis or a scrotum is seen on sonogram, it is a boy.