Question

How do ultrasound scan results know the gender of baby?

Answer 1

Here six important facts about ultrasound screenings and sex determination, according to Carr, a professor of obstetrics and gynecology at the Warren Alpert Medical School of Brown University.

1. A baby's gender is determined when the egg is fertilized.
2.Whether a baby will be a boy or a girl is determined at the time of conception, long before most women even realize they are pregnant.
3. Both the egg from the mother and the sperm from the father carry sex chromosomes. The egg always contributes an X chromosome, and the sperm can contribute either an X or a Y chromosome, depending on the sperm cell.
4. The sex of the baby is determined by the sperm cell that fertilizes the egg first. If the sperm is carrying an X chromosome, the baby will be a girl. If the sperm is carrying a Y chromosome, the baby will be a boy.
5. Ultrasounds were not designed for sex prediction.

U.S. hospitals have used ultrasounds since the late '70s and early '80s, Carr said. But the common prenatal scan wasn't intended as an exam to find out the baby's gender; it was meant to image the developing fetus for other medical reasons, he said.

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Answer 2

If the examination of the midline sagittal view of the genital area shows a caudal notch, the fetus is female, and if it shows a cranial notch, then the fetus is male. In the second and third trimesters of pregnancy, ultrasound imaging scans the genital anatomy of the fetus to identify its gender.