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Living with Meconium aspiration syndrome

A condition in which a newborn breathes a mix of meconium (first stool) and amniotic fluid into the lungs around birth.

Understanding Meconium aspiration syndrome

Meconium aspiration syndrome is a serious condition in which a newborn breathes meconium (the first stool) and amniotic fluid into the lungs.

This happens around the time of delivery. It can cause lung swelling (inflammation) and breathing problems after birth. It is seen in newborns and infants.

Signs & symptoms

Symptoms vary from baby to baby. GARD lists these among the most common:

  • Breathing difficulty
  • Signs of distress in the baby before birth
  • Abnormal heart rate changes
  • Birth after the due date (post-term pregnancy)
  • Delivery by C-section

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include lung and breathing specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Children's Interstitial Lung Disease Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Lung and breathing specialists (pulmonologists)
Expert care
Expert lists: Children's Interstitial Lung Disease Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Children's Interstitial Lung Disease Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What care does my baby need for breathing?
What follow-up will my baby need after leaving the hospital?
Which specialists, such as neonatologists, are involved?

Quick facts

Symptoms usually startNewborn and as an Infant

It happens when a newborn breathes a mix of meconium and amniotic fluid into the lungs around the time of delivery. GARD lists no gene or inheritance pattern.

Respiratory

Also known as: mas; mas - meconium aspiration syndrome; meconium aspiration; neonatal aspiration of meconium

Patient organizations

Source: NIH GARD · Meconium aspiration syndromeGARD ID 10494 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Meconium aspiration syndrome.

Explore the Meconium aspiration syndrome blog

Explore research for Meconium aspiration syndrome

Explore actively recruiting Meconium aspiration syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Meconium aspiration syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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