The Scoop on Baby Poop

Reviewed by Dan Brennan, MD on February 22, 2022

Week 4


If it seems like you're constantly changing diapers, you're not imagining it. By the end of this year, you'll have changed 2,300 diapers! Parents of twins -- double that number. Triplets ... you get the picture.

So you're not surprised when you open your baby's diaper, here's what to expect.

Breastfed babies:

  • Make yellow poop that's speckled with little seeds--like mustard
  • Poop one or more times a day, usually after they eat

Formula-fed babies:

  • Have tan, yellow, or greenish poop
  • Poop once a day, sometimes more often

What's normal:

  • Poop can come in a rainbow of colors, changing to yellow, green, or brown.
  • Some babies don't poop for a day or two -- even a week. You don't need to worry as long as your baby is still eating and gaining weight.

What's not normal (time to call your doctor):

  • Poop that is filled with mucus, water, or blood could be a sign of an allergy or infection.
  • Solid, hard poop means your baby is probably constipated.

Your Baby's Development This Week

You've seen a real transformation in the last month. Your little one has changed from a tiny newborn into a more active -- and interactive -- baby with a budding personality.

As they hit the big 1-month mark, here are just some of the new things they are able to do:

  • Move their head from side to side while lying on their tummy
  • Turn their head toward the sound of your voice
  • Coordinate their movements well enough to bring their hand to their mouth
  • Focus on a toy that's 12 inches away, although their eyes may still cross and that's OK
  • Recognize the smell of their mother's milk

Week 4 Tips

  • If your baby is constipated, try mixing a teaspoon of prune juice with breast milk or formula.
  • Save the baby wipes for messy poop clean-ups. A damp washcloth is good enough for cleaning after a wet diaper.
  • Your baby's neck muscles are getting stronger, but they still can't hold up their head on their own. Don't forget to support their neck whenever you carry them.
  • Do not hold your baby while you are eating or drinking anything hot.
  • When your baby seems ill, take their temperature with a rectal thermometer -- it's most accurate at this age.
  • A rectal temperature at or above 100.4 degrees Fahrenheit is a sign your baby could be sick. Call the pediatrician right away.
  • Your baby's one-month birthday is time for a well-baby visit. At the appointment, the doctor will measure your baby, check their health, discuss vaccines, ask how they have been eating and sleeping, and give some guidance for developmental goals.
  • You've been focused on your baby for a month now. Don't forget about your partner. Get a babysittter so you can get some time alone with your partner.

Show Sources


American Academy of Pediatrics: "Developmental Milestones: 1 Month."

American Academy of Pediatrics: "A Word on Wipes."

American Academy of Pediatrics: "Baby's First Days: Bowel Movements & Urination."

American Academy of Pediatrics: "Fever: When to Call."

AboutKidsHealth: "Your Baby's First Medical Visit."

Nemours Foundation: "Fever and Taking Your Child's Temperature."

American Academy of Pediatrics: "A Special Message to Fathers."

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