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Updated July 19, 2012

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.


The term micropreemie usually refers to a premature baby who is less than 800 grams (1 pound 12 ounces) or younger than 26 weeks at birth.

Survival rates of micropreemies depend on gestational age:

  • 22 weeks gestation: About 10% of infants survive
  • 23 weeks gestation: About 1/2 of infants survive
  • 24 weeks gestation: About 2/3 of infants survive
  • 25 weeks gestation: About 3/4 of infants survive

Although all micropreemies are very underdeveloped at birth and require constant medical care, many grow up with no long term effects of prematurity.

Read more about micropreemies

  1. About.com
  2. Health
  3. Preemies
  4. Glossary
  5. Definition of Micropreemie

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