What is a baby's poop when it's swallowed during birth?

When a baby swallows meconium during birth, it can lead to a condition known as meconium aspiration syndrome (MAS). Meconium is the thick, dark green substance that lines the intestines during pregnancy and is typically passed as the first stool after birth. If inhaled into the lungs, it can cause breathing difficulties and other respiratory issues. Medical attention is often required to manage potential complications associated with MAS.