How to Get a Set-In Baby Poop Stain Out of a Onesie

Mary Ylisela

Poop stains on your baby's onesie are par for the course, due to leaky diapers or loose stool. Stains caused by human feces are protein based and can leave permanent discoloration when not treated properly. An older or set-in stain must be treated to remove proteins as well as discoloration.

Onesies are a staple in many baby wardrobes.

By tackling the source of the stain, rather than just the discoloration, you can successfully remove a baby poop stain from your child's cotton onesies.

    Dishwashing detergent is helpful in removing many laundry stains.
  1. Mix 1 quart lukewarm water with 1/2 tsp. dishwashing detergent and 1 tbsp. ammonia. Place the onesie with the set-in baby poop stains in the ammonia and detergent solution and allow it to soak for 15 minutes. Before removing the onesie, scrub the fabric together at the site of the stain to help loosen it.

  2. Dunk the onesie in and out of the ammonia and detergent solution to agitate it. Set the garment in the mixture to soak for another 15 minutes.

  3. Rinse the onesie in cool water then wring out the excess moisture. Empty the bucket of the ammonia solution and rinse it out thoroughly. Mix the enzyme stain remover in water, according to the package directions. Submerge the onesie in the enzyme stain remover solution and allow it to soak overnight.

  4. Chlorine bleach helps remove stains from white clothing.
  5. Launder the onesie in warm water with laundry detergent and bleach. If the onesie is all white, use chlorine bleach to help remove the remaining stain. Use oxygen bleach for onesies with designs or other colors.

  6. Pour 1 cup white vinegar into the rinse cycle to remove any odor that lingers on the onesie. Check to see that the entire stain has been removed before drying the onesie. Repeat the stain removal steps to remove any last trace of the stain.

  7. Tip

    Treat a stool stain as promptly as possible for the simplest stain removal. Soak the onesie in undiluted vinegar to help remove the stain and accompanying odor.


    Avoid washing the stained onesie in hot water or placing it in the dryer as both cause the protein in feces to cook, leading to a permanent stain.