Mecomium is the earliest stools passed after by a new born child.

This stool is quite different than the typical feces that is expressed a few days after birth.

Meconium is material ingested while in the uterus and includes:

  • Mucus
  • Lanugo
  • Bile
  • Amniotic fluid
  • Intestinal cells
  • Water
  • and more


  • Black
  • Sticky
  • Appearance to tar
  • Viscous
  • Odorless

*** Feces are typically yellow in color and with plenty of odor


Normal Meconium passage

Normally passage of the meconium occurs following birth, but occasionally it can be passed into the amniotic fluid prior to birth

85-90% passage within the first 24 hours of birth

8-10% passage within 48 hours

Hirschsprung’s disease is  a medical condition that often has the symptom of a newborn having difficulty passing their meconium.


Testing of Meconium

Recent research points to the advantage of testing meconium for various drugs

Infants who have been exposed to large amounts of alcohol while within the uterus often will have an alcohol byproduct in their mecomium.

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