When Does Baby Gender Develop During Pregnancy?

Learn when baby's gender is developed in pregnancy and the key milestones in gender differentiation.

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Baby gender development typically occurs around week 9 of pregnancy. By this time, the baby's genetic sex (XX for female, XY for male) has been determined, and primitive gonads begin to form into either testes or ovaries. However, clear anatomical differences may not be visible until later in the pregnancy, often during an ultrasound around the 18-20 week mark.

FAQs & Answers

  1. At what week can you know the baby's gender? While the baby's genetic sex is determined around week 9, clear anatomical differences are usually visible during an ultrasound at weeks 18-20.
  2. How is a baby's gender determined? A baby's gender is determined by their genetic makeup—XX for females and XY for males, established at conception.
  3. What should I expect at the 20-week ultrasound? At the 20-week ultrasound, you can expect to see the baby's gender, check for anatomical development, and assess overall fetal health.

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If you're curious about other pregnancy milestones and developmental stages, check out our related content on prenatal care and ultrasound tips to guide you through your pregnancy journey.

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