Q&A: What Should Baby's Stool Look Like?

What could make my baby's poop mucousy and stinky?
profile picture of Jeanne Cygnus, IBCLC, RLC
ByJeanne Cygnus, IBCLC, RLC
Lactation Specialist
Updated
Jan 2017
Hero Image

When a baby is exclusively breastfed, her poop is generally very mild smelling and may be either liquid or the consistency of cottage cheese. Adding anything else to her diet, such as formula or another supplement, can cause a dramatic change in the odor and appearance of her poop.

If your baby is getting nothing but breast milk and suddenly develops a lot of mucus or blood in her stool and the odor is foul, then it is important to have her checked by her doctor. It is possible that she is reacting to a protein in your diet — such as cow’s milk protein — causing her gut to become raw and irritated. It is also possible that she has a bacterial or viral infection that needs further treatment. If she is running a fever or not eating well, then it is important for her to be checked right away. If she’s otherwise content, but you’re noticing a lot of mucus in her stools, keep track of what you’re eating, and see if the mucus subsides with a change in your diet (like eliminating dairy products). If it does not resolve, or it gets worse, then definitely take her to the doctor.

Related Video

Diarrhea in Babies

Paul Horowitz, MD
Pediatrician

DYPER Launches First-Ever National Diaper Composting Service

Nehal Aggarwal
Associate Editor
Published
02/19/2020

Q&A: What's Wrong With My Baby's Poop?

Jeanne Cygnus, IBCLC, RLC
Lactation Specialist

What Should Formula Poop Look Like?

-- Sabrina Braham, MD, pediatrician in Menlo Park, California and adjunct clinical faculty member at Stanford University
Pediatrician

Newborn Poop?

The Bump Editors

Bloody Stools in Babies

Paul Horowitz, MD
Pediatrician

Green Toddler Poop?

Michael Lee, MD, assistant professor of pediatrics at UT Southwestern Medical Center and pediatrician at Children’s Medical Center Dallas
Pediatrician

Q&A: Baby's Pooping Eight Times a Day. Is This Normal?

Deborah Davis, MD, pediatrician
Pediatrician

Mom’s Tale of Cleaning Poop Off a Slide Has the Internet Cracking Up

Laurie Ulster
Contributing Writer
Published
10/03/2019

Q&A: What's Normal Baby Poop?

Dr. Leigh Serra
Pediatrician

Q&A: How Much Pooping Is Normal?

Jeanne Cygnus, IBCLC, RLC
Lactation Specialist

How Will I Know if Baby Has Diarrhea?

Jack Newman, MD, FRCPC
Pediatrician

How Can I Fix Baby's Constipation?

Excerpted from You Raising Your Child by Mehmet C. Oz, MD, and Michael F. Roizen, MD
Advertisement