Every newborn normally passes a first stool called meconium. This typically occurs within 24 to 48 hours after birth.

Meconium matters because it signals that the baby’s digestive system is working properly. If meconium is not passed on time, parents should stay alert and consult a doctor right away.

What Is Meconium?

Meconium is the initial stool passed by a newborn. Unlike regular stool, its characteristics include a greenish-black color, a thick and sticky texture, and no odor.

Meconium is composed of water, shed skin cells, mucus, fine hair (lanugo), bile, and other substances that collect in the fetal intestines during pregnancy.

During pregnancy, the fetus swallows amniotic fluid as part of gastrointestinal and breathing practice. These swallowed materials build up in the intestines and form meconium, which is stored until delivery.

After birth, stimulation from labor, temperature shifts, and exposure to the outside environment prompt the first bowel movement, leading to the expulsion of meconium.

The passage of meconium is a key milestone that indicates the baby’s digestive function is intact.

Why is Meconium Passage So Important?

The passage of meconium is essential in the early assessment of a newborn’s health. If meconium is not passed within 24 to 48 hours, this delayed meconium passage can be an early sign of gastrointestinal problems or other conditions, such as:

Meconium Ileus

A situation in which meconium is unusually thick and sticky, blocking the end of the small intestine and preventing the first stool from passing.

Cystic Fibrosis

Cystic fibrosis is a genetic condition that thicken the mucus in body organs, including in the gut and lungs. In affected newborns, this thick mucus can obstruct the intestines, lead to meconium ileus, and make it difficult to pass meconium.

Intestinal Obstruction

Obstruction may arise from an intestinal malformation or narrowing. This blockage prevents meconium from moving from the intestine to the anus.

Rectal Congenital Disorders

Some babies are born with congenital disorders of the rectum or anus, such as anal atresia, where the anal opening is absent or not in the usual position. As a result, meconium cannot leave the body.

Meconium Plug Syndrome

In this condition, a dense plug of meconium blocks the lower large intestine, preventing the first stool from being expelled.

Hirschsprung’s Disease

Hirschsprung’s disease is an intestinal motility disorder that disrupts bowel movements, preventing stool, including meconium, from being pushed out.

For these reasons, meconium passage is very important for newborns. If your baby has not had a bowel movement within 48 hours, has a distended abdomen, or vomits repeatedly, contact a doctor immediately. You can also speak with a doctor through the Ai Care health consultation service, available on the App Store and Play Store.

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