Baby’s first poop (meconium): What should you know

That first poopy diaper can catch new parents off guard: instead of what you might picture, there’s a sticky, dark greenish-black substance called meconium — your baby’s first poop. [1] It can look a little startling, but it’s a normal sign that your newborn’s digestive system is doing its job. Here’s what meconium is, how long it lasts, and what’s typical in those early newborn days.

What is meconium?

Meconium is your baby’s first stool, and it forms long before birth. As your baby grew in the womb, their intestines filled withthe contents they took in, such as cells, fats, and intestinal secretions like bile. [2] All of that collects and typically waits to be passed in the first hours and days after birth.

What does a newborn’s first poop look like?

The first thing most parents notice is that meconium doesn’t really look like poop at all. Here’s what shows up in those early diapers: [1, 2]

• Color: dark green to nearly black 

• Texture: thick and sticky

• Overall look: tar-like rather than soft

• Cleanup: sticky enough that it can be tough to wipe off

When do newborns have their first poop?

Most babies pass meconium soon after birth, though the exact timing varies a little from one baby to the next. The majority go within the first 24 hours, and nearly all healthy full-term newborns have passed their first stool by 48 hours. [3] For most families, that means it happens while you’re still in the hospital, in those first busy days with your new baby.

How many meconium poops are normal?

In the first few days, it’s natural to find yourself counting diapers and wondering what’s considered normal. There isn’t a set number of meconium poops to expect, though. In the first day or two, some babies have only one or two stools a day, and meconium can come all at once or across a few diapers. [4]

What matters more than the count is that meconium shows up at all: nearly all healthy full-term newborns pass their first stool within the first 24 to 48 hours, which is the sign that your baby’s digestive system is working. [3] That’s why so many hospitals and birthing centers like to see that first stool before discharging you with your new baby. In the early days, those diaper counts are also a handy general sign that feeding is getting established.

How long does meconium last?

Meconium doesn’t stick around! It usually clears within the first few days of your baby’s life, and feeding helps move it along. 

The transition from meconium to regular baby poop

Once the meconium clears, your baby’s poop will start to change, and those shifts are typically a reassuring sign that feeding is taking hold. The early stools are dark and sticky, then lighten into greenish transitional poops over the next few days. From there, they’ll usually settle into the yellow-green stools typical of a baby who’s generally feeding well. [1]

When to ask your pediatrician about meconium

Meconium is a normal, healthy part of those first newborn days. Your care team will be watching closely for the signs that matter. Whether you’re still in the hospital or settling in at home, it helps to know what to keep an eye on and to trust your instincts if something feels off. Reach out to your pediatrician if you notice any of the following:

• No first stool in the first 24 hours: A full-term baby who hasn't passed meconium within 24 hours needs to be checked out, since this can point to a blockage. [3]

• A swollen belly or vomiting with no stool: Not passing meconium, along with a distended belly, refusal to feed, or vomiting (especially green or bile-colored) can signal an obstruction and warrant prompt attention. [5]

• Black, tarry stools that continue past the first several days: once transitional stools should have started, meconium-type poop that keeps appearing is something your healthcare provider will want to know about.

Takeaway

• It’s normal: Meconium is your baby’s first stool and a healthy, expected part of the newborn days.

• It looks very different from what you might expect: The dark, sticky, greenish-black appearance is nothing like the poop that comes later.

• Timing varies from baby to baby: Most newborns pass meconium within the first day or two, but there’s no set number of diapers to expect.

• Changing stools are a good sign: As feeding gets going, poop shifts from meconium to greenish transitional stools, then to yellow-green stools.