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10th Week of Pregnancy

Baby Smarts

Baby Development at 10 Weeks Pregnant

By the beginning of the 10th week of pregnancy, all of your baby's vital organs have formed.

 
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Baby's Growth and Development at 10 Weeks Pregnant

It's official! After weeks of life as an embryo, by the end of the 10th week of your pregnancy, your baby becomes a fetus*. Here are some of the other changes your baby is going through during your 10th week of pregnancy:

  • By the 10th week of pregnancy, your baby measures more than one inch, or roughly the length of a quarter. By the end of the 1st trimester, your baby will grow to be about 3 inches — around the length of a kiwi fruit. This measurement doesn't even take into account arms and legs. That's because in the 1st trimester, your baby is measured from the top of the head to the bottom of the rump.
  • By the beginning of the 10th week of pregnancy, all of your baby's vital organs have formed.
  • His embryonic tail, located at the bottom of his spinal cord, has disappeared.
  • His bones continue to develop. On an ultrasound, your baby's bones appear white.
  • At 10 weeks pregnant, his ears get close to their final form.
  • His teeth buds emerge and his eyelids develop further.
  • His testes start producing the male hormone testosterone around the 10th week of pregnancy.
  • Tiny fingers and toes are fully separated (no more webbing).
  • Plus, your baby's brain growth really takes off. Every minute, 250,000 new neurons (or first brain cells) are produced.
* According to the Mayo Clinic Guide to a Healthy Pregnancy
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