- The thing about poop, it's a window into the, not the soul, but definitely into the body.

(upbeat music) - It is an ever-changing rainbow of colors and textures.

(light music) - All right, Bethany.

I want your first memory of poop that you saw in your little one's diaper.

- Oh.

- Very, very first poop.

- Oh God, it was meconium.

And the nurse warns me about it.

She said it was gonna be black and sticky and tarry, and impossible to wipe off.

But I didn't really believe it 'cause I was like, it's just a baby.

Like it's not-- - It's just poop.

- It's just a baby.

Just a poop.

It's not like a tar machine or anything.

Of course you couldn't clean it up, but no.

- It's got all this material that baby ingested, you know, intestinal cells, amniotic fluid, bile, mucus, hair.

- Hair!

- Babies actually, believe it or not, start growing and shedding hair while they're in utero, in the womb.

And when they shed it, they eat it right up and it winds up in meconium.

Step one of making meconium in the kitchen.

Prunes.

- Prunes.

- Okay, all right, all right, all right.

- Yeah, you said don't skimp.

- [Alok] And we have this prune juice, perfect.

- [Bethany] Prune juice.

(blender whirring) - Okay, yeah!

It's stuck.

I think we need more prune juice.

- Yeah.

- To get back to that newborn baby poop.

How are we looking?

- Oh, it's getting there.

- It's getting there.

- Yeah.

This is starting to put me in mind of me baby's diaper.

(blender whirring) - [Alok] (laughing) Actually, It's pretty close.

- It looks super nasty.

- Even though it looks nasty, this is excremental gold.

This is what every pediatrician wants to see in that very first newborn poop.

This tells us that baby's intestines are up and running.

Looks gross, but I'm gonna be honest with you.

- No!

- Oh!

(gagging) Meconium does not last forever.

Sadly, for people who like tarry, sticky messes.

Meconium is actually going to graduate from kindergarten, and turn it into transitional stool.

(humming "Pomp and Circumstance") - What do you think of that color?

- Okay.

- All right.

- This Bob Ross painting of a transitional stool is coming alive with golden raisins.

- [Bethany] That's a very, very happy stool.

- So a little bit more yogurt.

Just give me a little bit more bulk.

- (both) Three, four!

- Dare you do five?

Dare you do five?

- Don't dare me.

- It's for the transition.

- Yo, don't dare me!

- I think it might need a little zest from the orange.

- More, ooh!

Does anyone have a microplane?

- So we're starting to show transitional stool.

But more importantly, it's starting to smell great.

You're going to start to see this When baby starts taking in formula or breast milk.

Food comes in, bacteria has a little metabolic party.

(dance music) Water gets reabsorbed.

You create actual bulk!

And this is great news, because this is telling us that the kid is relying on the power of his or her gut.

Do you think I should try some of this face wash right now?

You're going to do it whether I think that's appropriate or not.

So dude, you do you, Alok.

- I once saw orange zest being sold.

And I'll be honest, like right now.

- Can you feel the hydration?

- First child, you said she was only breastfeeding.

What did her poop start to look like after our wonderful transition stool?

- Like grainy mustard.

And it smelled like a grassy field.

It didn't smell bad.

It smelled really, like natural and nice.

- Formula stool tends to be a little bit more real-world.

And it stinks.

Breastfed babies' stool does not.

It's a little bit lighter and looser.

Breast milk has a natural laxative component to it.

And it tends to move really fast through their gut, making those stools which you probably remember were plentiful, sometimes explosive.

(dramatic music) - This stool defies gravity.

(Alok laughs) It goes up the diaper.

Up and out.

Out of the back and out the diaper.

- So tell me when your kids started to eat real-world food.

- That's when it got real.

Stinky, more like poop.

You know.

- More like?

- Like poop that you see in the subway.

Nico was probably eating solid foods at six months.

'Cause he was a hungry baby.

- He was like right on-- - He was hungry.

- When pediatricians say kids can.

- Oh God, here we go.

- In any other context, this would look delicious.

Can we use the bagel and maybe crumple it up a little bit.

To give me a little bit of inconsistency in the texture.

- Here we go.

- Just like the kind of stool you would see in the park.

- Bagel.

Park stool is different.

- Park stool is different.

- I think park school is different.

I think that subway stool is more urgent.

Oh, there's a sense of urgency with subway stool, okay.

- I think parks stool, there's a bigger range of stool.

- So park stool might be strategic.

- Park stool is more like, oh, it's noon.

- If I happen to have a potato, we could add a little bit of bulk to this stool.

Bethany, if you wouldn't mind mashing, grinding, cutting, do anything you can to add some potato bulk to our baby stool.

- Oddly enough, I have a prepared potato right here.

Let's use this one.

(laughs) - Did you just know I was going in this direction?

- [Bethany] This is my son's favorite texture of stool.

Do you have to?

No, don't.

(gagging) - It's actually not bad.

That's actually not bad at all.

- How did I know you were gonna say that?

- I mean, to be honest, I think you were right.

I think that the bagel adds a little bit of like earthiness to it, and the mustard does cut down the sweetness.

I actually think of all the poops that we've made today, this one is actually a winner.

Dare you to.

That one has breast milk stool on it.

- No, no.

- You have not tried any of them.

- No, no, that's okay.

- You literally have not tried one.

I had one on my face.

- I'm keto.

- Are you really?

- I'm on keto, yeah.

- Is poop involved in keto?

(laughing) - Yeah, you can't eat poop.

(disco music) - We can emulate a little bit more bulk in here.

If I just happen to have a potato.

(Bethany laughs) If I had a potato.

(Bethany laughs) If I had a potato.

(Bethany laughs) I missed that one completely!

All right, we're going to get this.

I swear to God.

If I happen to have a potato.

(futuristic music) (light music)