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Fetal Development

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Updated July 01, 2014

5 of 10

10 Week Fetus
Fetal Development

The baby now enters it's fetal period. The average size is approximately 27-35 mm crown to rump length (CRL), or 1.06-1.38 inches. S/he weighs in at 4 grams, or 4 paper clips. Tiny toes have formed. The eyes are largely open, but the eyelids are beginning to fuse, and will stay that way until 25-27 weeks. External genitalia is beginning to differentiate. External ears are completely formed, as well as the upper lip. The biggest accomplishment this week is the disappearance of the tail!

More on Week 10 of Pregnancy

Photo © A.D.A.M. in Fetal Development

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