Is it the dad that decides if baby is a boy or girl?

No, the father does not decide the sex of the baby. The sex of a baby is determined by the mother's eggs, which contain either an X or a Y chromosome.

Here's how it works:

* Females have two X chromosomes (XX).

* Males have one X and one Y chromosome (XY).

* The mother always contributes an X chromosome.

* The father contributes either an X or a Y chromosome.

If the father contributes an X chromosome, the baby will be female (XX).

If the father contributes a Y chromosome, the baby will be male (XY).

So, while the father's sperm plays a role in fertilization, the sex of the baby is ultimately determined by the chromosome in the mother's egg.

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