Meconium Aspiration Syndrome

**Semantic type:** Disease or Syndrome

**Definition:** A serious condition in which a newborn breathes a mixture of meconium (the first intestinal discharge) and amniotic fluid into the lungs around the time of delivery. Meconium aspiration syndrome occurs in 5-10 percent of births and typically occurs when the infant is stressed, as when the infant is past its due date.

**Synonyms:** - MAS - Neonatal Aspiration of Meconium