According to my experience of giving birth to a baby twice, morning sickness has nothing to do with giving birth to a boy or a girl, so morning sickness can't judge the sex of the baby in the expectant mother's belly. Those remarks about whether you are pregnant with a boy or a girl are completely nonsense and have no scientific basis.

The severity of morning sickness is not a criterion to judge the sex of the fetus.

Fetal sex is determined by chromosomes.

Normal human cells have 23 pairs of chromosomes, of which 22 pairs are autosomes, and only 1 sex chromosome determines sex. There are two kinds of sex chromosomes: X chromosome and Y chromosome. The male sex chromosome is xy type and the female sex chromosome is xx type.

Women's eggs have only one X chromosome, while men's sperm have two kinds of chromosomes, X and Y. When the sperm of X chromosome combines with the egg, the fertilized egg chromosome is xx type, which is a female fetus, while the sperm of Y chromosome combines with the egg, and the fertilized egg chromosome is xy type, which is a male fetus.