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Meconium Aspiration Syndrome


Meconium is a baby's first bowel movement. Meconium aspiration syndrome (MAS) develops when the baby aspirates (breathes in) meconium. This usually happens while he is still in the womb but may happen during or shortly after birth. MAS ranges from mild to life-threatening.



Your baby may need extra oxygen to help him breathe easier. Oxygen may be given through a plastic mask over his mouth and nose. It may be given through a pair of short, thin tubes that rest just inside his nose. Ask your baby's healthcare provider before you take off the mask or oxygen tubing.

Follow up with your baby's healthcare provider as directed:

Write down your questions so you remember to ask them during your visits.

Contact your baby's healthcare provider if:

  • You have questions or concerns about your baby's condition or care.

Seek immediate care or call 911 if:

  • Your baby is not breathing or is having trouble breathing.
  • Your baby's skin or nails look blue.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

Learn more about Meconium Aspiration Syndrome (Discharge Care)

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.