What decides if a baby going to be boy or girl?

The sex of a baby is determined by the sperm that fertilizes the egg.

Here's how it works:

* Eggs always carry an X chromosome.

* Sperm can carry either an X or a Y chromosome.

* If a sperm with an X chromosome fertilizes the egg, the baby will be female (XX).

* If a sperm with a Y chromosome fertilizes the egg, the baby will be male (XY).

So, the father's sperm determines the sex of the baby!

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