Pregnancy glossary

Meconium

Also called: First stool

The thick, sticky, dark greenish-black substance that forms your baby's first stool.

When it comes up: First days after birth

Meconium is made up of materials your baby swallowed while in the womb, such as amniotic fluid and skin cells. Passing it is an excellent sign that your baby's digestive system is working efficiently.

Sometimes, the fetus may pass meconium inside the womb before birth. If this happens, the medical team will carefully monitor your baby to ensure they do not inhale this substance into their lungs.

Read more in the Nawah guide →

This guide is general information, not medical advice. It does not replace a doctor, and it knows nothing about your particular pregnancy. If something feels wrong, contact your doctor instead of waiting for the next scheduled visit.