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Q&A: How Is My Baby's Gender Determined?

How is my baby's gender determined?
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profile picture of Dr. Joseph Hill
Cardiologist
Updated
March 2, 2017
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The sex of a baby is determined by two sex chromosomes inherited from both the genetic parents. A baby will normally inherit one sex chromosome from the mother and one from the father. A woman has two X chromosomes and thus gives either of her X chromosomes. The father has one X chromosome and one Y chromosome, can give either his X or Y chromosome. The egg (from the mother) already contains an X chromosome. Therefore the sex of a baby is determined by the X or Y chromosome of the  sperm cell from the father. A baby girl will result if there is XX, and a baby boy will result if the final arrangement is XY. It is possible to have an abnormal arrangement of sex chromosomes, however, this is very rare.

Please note: The Bump and the materials and information it contains are not intended to, and do not constitute, medical or other health advice or diagnosis and should not be used as such. You should always consult with a qualified physician or health professional about your specific circumstances.

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