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10 1/2 inches long and 3 quarters of a pound. Checkout www.pregnancy.com you can see week by week of how you're baby looks and the different things you may experience. GOD BLESS

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9y ago
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15y ago

No baby has yet survived being born at 21 weeks.

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15y ago

At 21 weeks, the fetus is roughly 3/4 pound (360 grams) and from crown to heel is roughly 10.5 inches (27cm) long

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12y ago

Generally speaking week 24 is concidered the earliest a premature baby is viable, but there are exceptions to this and a few babies born as early as 22 or 23 weeks have survived.

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11y ago

The fetus is into the second trimester at 21 weeks. In order to find out more information on the baby, websites such as BabyCenter have a ton of information on the subject.

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Q: What size is a 21 week fetus?
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