Dr. Mona's Mom Blog

Baby poop basics

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Who knew you would be so concerned with baby poop?

Before becoming a parent, you probably didn’t know how concerned you’d be with your baby’s poop! If baby isn’t here yet – take note! In this blog post I break down what you need to know about baby poop.

In breastfed babies, stool typically transitions as such (timing can vary):

  • Day one: Black, tarry, and sticky. This is meconium and important for baby to pass.
  • Days two-three: Black/brownish or brownish/greenish
  • Days four-five: Greenish/yellowish
  • After day five: Yellow and seedy

Some babies may transition through these colors quicker or slower. Weight gain is something we monitor as well to ensure feeding is going well.

Formula-fed babies do not always transition through these, and that is okay! They may have more firm stool, but the color should also be in the earth-tones!


  • Consistency doesn’t matter as much as certain colors.
  • Babies can have loose or thicker poop.
  • If baby is having excessive loose poop and not gaining weight, this should be brought up to your child’s clinician.


  • Poop can be any color except black, red, or white. Earth-tone colors are common. If you are concerned, you can speak to a clinician.
  • Mucus stool is okay in a baby who is gaining weight.
  • If the mucus also has streaks of blood, baby is very irritable with feeds, and/or spitting up more than usual, speak to child’s clinician.

But, wait – what if baby isn’t pooping?! Download my free guide to find out and get more need to know info!

P.S. – Listen to Monday Mornings with Dr. Mona where I answer a question from a mom about poop changes and constipation when introducing solids.

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All information presented on this blog, my Instagram, and my podcast is for educational purposes and should not be taken as personal medical advice. These platforms are to educate and should not replace the medical judgment of a licensed healthcare provider who is evaluating a patient.

It is the responsibility of the guardian to seek appropriate medical attention when they are concerned about their child.

All opinions are my own and do not reflect the opinions of my employer or hospitals I may be affiliated with.