meconium

a baby's first feces or bowel movement, poop

A greenish-brown substance that comes from a baby's digestive tract and is ordinarily passed after delivery as the baby's first stool. Sometimes, the meconium is passed before birth, in which case it stains the amniotic fluid, turning it greenish brown.

mucous

phlegm, nose fluid, mouth fluid, throat coating

fluid present in the nose and windpipe

a thick fluid produced by the lining of some tissues of the body