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Meconium

Meconium

Meconium is a thick, greenish black substance that forms in the intestines of an unborn child (fetus). As the fetus swallows and digests the fluid (amniotic fluid) inside the womb, it produces meconium.

Meconium in the amniotic fluid may be a sign that the newborn experienced stress before birth. If meconium gets into the baby's lungs, it can cause irritation and inflammation of the lungs.

When the baby is born, meconium is the first stool the baby passes. Most newborns pass the meconium within 48 hours after birth.

If your baby doesn't pass his or her first stool within the usual time frame, it may be a sign of a blocked intestine or another problem. Your baby may need treatment to remove the stool from the body.

Current as of: July 18, 2013

Author: Healthwise Staff

Medical Review: John Pope, MD - Pediatrics & Susanna McColley, MD - Pediatric Pulmonology

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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