Key takeaways: Breast milk changes color naturally. Colostrum is often yellow or orange; mature milk may look white, bluish, or creamy. Foods, dyes, and supplements can tint milk green, pink, or other colors. Pink or rusty milk can come from small amounts of blood and is often harmless, but ongoing blood or pink milk with other symptoms should be checked.
Seeing your milk in a bottle or bag might surprise you. Many color changes are normal.
Normal Colors
- Yellow or orange: colostrum, rich in beta-carotene and antibodies.
- White or creamy: mature milk, especially later in a feed.
- Bluish or watery: milk at the start of a feed, which is lower in fat.
- Separated layers: fat rises to the top when milk sits. Swirl gently to mix.
Colors From Foods or Medicines
- Green: green vegetables, spirulina, green-colored drinks or supplements.
- Pink, orange, or red tints: foods with dyes, beets, or some drinks.
- Black: has been reported with the antibiotic minocycline. Tell your doctor if you notice this.
Pink, Red, or Brown Milk
- Small amounts of blood from cracked nipples can tint milk pink or brown. Your baby may spit up streaks of blood. Usually fine to keep feeding, but treat nipple damage.
- “Rusty pipe syndrome”: in the first days after birth, some people have rusty or brown milk from increased blood flow to the breasts. It usually clears within a week.
- Bacteria: rarely, milk stored for a time turns pink from bacterial growth (for example, Serratia marcescens). Discard it and talk with your doctor.
When to Call Your Doctor
- Blood in milk lasting more than a week.
- Blood with a lump, pain, or nipple discharge when not feeding.
- Pink milk that develops while stored.
- Black milk.
The Bottom Line
Breast milk naturally varies in color, and diet can tint it. Most changes are harmless, but ongoing blood or unusual colors should be checked.
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Sources
- Lawrence RA, Lawrence RM. Breastfeeding: A Guide for the Medical Profession. 9th ed. Elsevier; 2022.
- Cizmeci MN, Kanburoglu MK, Akelma AZ, Tatli MM. Rusty-pipe syndrome: a rare cause of change in the color of breastmilk. Breastfeed Med. 2013;8(3):340-341.
- La Leche League International. Breast milk color. https://www.llli.org
This article is for general education and is not a substitute for individualized medical advice. Always talk with your baby’s health care provider or your own provider about your specific situation. If you think your baby or you may have a medical emergency, call 911.
