Is black poop normal in newborns?

Yes. The first poop your baby passes is called meconium - a dark greenish-black, sticky substance made of amniotic fluid, skin cells, and bile. Meconium is completely normal and healthy for the first 3-4 days of life.

What is meconium and when does it stop?

Meconium is your baby's first stool - that tarry, dark greenish-black poop. By day 2-3, it transitions to greenish-brown, then by day 4-5 to yellow (breastfed) or tan (formula-fed). This transition takes about a week. If you're still seeing meconium after day 4-5, call your pediatrician.

When is black poop a problem?

After the first 3-4 days of life, black or tarry stools can indicate digested blood in the intestines - a sign of bleeding somewhere in the GI tract. This needs medical attention the same day. Call your pediatrician or go to urgent care.

Could my baby be bleeding if I see black poop after day 4?

It's possible, but not certain. Black tarry stools after day 4 are called melena and can indicate blood in the digestive tract from causes like an anal fissure, swallowed blood from cracked nursing nipples, or (rarely) an intestinal issue. Your pediatrician will want to examine your baby.

What's the difference between meconium and a problem?

Meconium (first 3-4 days): dark greenish-black, sticky, tar-like consistency. Problem stool (after day 4): continues to be black, tarry, or even appears almost like ground coffee. If in doubt, take a photo and text your pediatrician or call - better safe than sorry.

Black Baby Poop: Meconium vs. When to Worry

You open the diaper and see something that looks like black tar. Your heart skips. Then you remember reading somewhere that this is normal. So which is it?

The good news: in the first 3-4 days of life, black poop is almost certainly normal and nothing to worry about. After that, it's worth investigating. Here's how to tell the difference.

The First 3-4 Days: Meconium is Normal

Your newborn's first poop is called meconium. It's a dark greenish-black, sticky, tar-like substance made from amniotic fluid, skin cells, lanugo (baby fuzz), bile, and whatever else was in the amniotic sac.

Meconium is completely healthy and expected. It has nothing to do with what baby ate (since they haven't eaten yet). It's more about cleaning out the digestive system before real feeding begins.

The Meconium Timeline

Hours 0-12: First meconium (sticky, dark)
Days 2-3: Transitional stools (greenish-brown)
Day 4-5 onward: Should be yellow (breastfed) or tan (formula-fed)

If you're still seeing black or very dark green meconium-like stools on day 5 or later, and baby hasn't started feeding well, that's worth a call to your pediatrician.

After Day 4: Black Poop is a Red Flag

Once the meconium transition is complete, black tarry stools (especially if they look like ground coffee) can indicate blood in the stool. This is called melena and needs same-day medical attention.

What Could Cause Post-Meconium Black Poop?

Swallowed maternal blood: If you're breastfeeding and have cracked nipples, baby may swallow some blood. Not dangerous for baby, but worth discussing with your pediatrician.
Anal fissure: A tiny tear from constipation. Usually causes bright red blood, but if swallowed can cause dark stools.
Intestinal bleeding: Rare, but needs evaluation. Could be from an infection, allergy, or structural issue.
Swallowed blood from delivery: Occasionally during birth, babies swallow some blood. Usually passes in the first few days but can linger.

How to Tell the Difference

Meconium (Normal)	Black Poop (Concern)
Timing: First 3-4 days	Timing: After day 4
Consistency: Thick, sticky, tar-like	Consistency: Often looser, like coffee grounds
Baby's health: Feeding well, alert, normal color	Baby's health: May be fussy, feeding issues
What to do: Nothing - this is normal	What to do: Call your pediatrician same day

Don't Second-Guess Yourself

Here's the truth: if you're unsure whether you're still in the meconium phase or if you're seeing something concerning, take a photo and text it to your pediatrician. This is exactly what on-call nurses are there for, and a picture tells them everything they need to know.

Most of the time, it's just meconium. But if there's any chance it's bleeding, it's worth a quick conversation with your doctor.

Track Your Baby's Poop Progress

Instead of trying to remember what day 2's poop looked like compared to day 4, use PipPoopie to document the timeline. Our app lets you track color changes, snap photos for quick pediatrician consultations, and see patterns that matter. In the newborn phase especially, having that visual record can be invaluable when talking to your doctor.