Purple Breast Milk: Causes and When to Call Someone

Why Is My Breast Milk Purple?

Breast milk takes on color from what passes through your body and from anything that touches the milk. Purple is rare, so it usually has a traceable cause. The most likely ones are:

• Food and drink dyes. Purple or blue drinks, candies, ice pops, frosting and other dyed foods can tint milk for a day or so. Many parents also notice green, pink or orange tints after strongly colored foods.
• Gentian violet.This purple antiseptic dye is sometimes used on sore nipples or a baby's mouth when thrush is suspected. It stains skin, clothing and milk (see the next section).
• Blood mixed with milk. A small amount of blood from a cracked nipple or from pump trauma can look pink, red or rusty, and in some lighting or once stored it can look darker or purplish.
• Medicines and supplements. Some medications change milk color. Tell your pharmacist or doctor that you are breastfeeding when you start anything new.
• The container. Dyed bottle liners, stained pump parts or colored storage bags can make milk look off. Check by pouring a little into a clean, clear cup.

Think back over the last day or two: what you ate and drank, any creams or medicines used, and whether you had nipple pain. Write down what you find. It helps if you do need to call someone.

Gentian Violet and Purple Breast Milk

If you or your baby were recently treated for thrush, gentian violet is the obvious suspect. It is a deep purple dye, so purple milk after using it is expected. The color is not the main concern, though. The NIH LactMed database notes that gentian violet can irritate mucous membranes and has caused mouth ulcers in breastfed infants, and that several countries have restricted its use.

If you have used it, or want to, ask your doctor or a lactation consultant first. Other treatments for thrush exist, and they can confirm whether thrush is really the problem, since nipple pain has other causes. Do not apply it to your baby's mouth on your own.

Breast Milk Colors: What Is Normal?

Breast milk is not one fixed color, and it changes within a single pumping session as fat content rises. This table summarizes common breast milk colors. It is a general guide, not a diagnosis.

Is Purple Breast Milk Safe to Feed?

If the color clearly comes from a food dye and your baby is feeding well, the milk is generally fine, and the tint usually fades within a day or two. If the cause is gentian violet, blood, or a medication, or if you simply do not know, the safer move is to pause and check with your baby's pediatrician or a lactation consultant before feeding that milk. Freshly pumped milk can be kept cold in the meantime. The CDC's breast milk storage guidance covers how long milk keeps in the fridge or freezer.

Keep feeding your baby from the breast or with other milk while you sort it out. If volumes are a worry, the expressed breast milk guide shows typical bottle amounts by age.

Ducts, Blood and Other Causes to Know About

Pink or rusty milk in the first days is often called “rusty pipe” milk: extra blood vessels in the breast can leak a little blood into the ducts. It usually clears up in days. Later, cracked or damaged nipples, a poorly fitting pump flange or strong suction can add blood to expressed milk. Pain, redness, a hard area or fever can point to a blocked duct or mastitis, which needs prompt advice rather than waiting it out.

When to Call a Doctor or Lactation Consultant

• You cannot explain a purple, red, rust-colored or dark tint.
• The color lasts more than a day or two or keeps coming back.
• You have breast pain, redness, a hard lump or a fever.
• Your baby has white patches in the mouth, is refusing feeds, or has fewer wet diapers than usual. See signs your baby is eating enough.
• You started a new medicine and the color changed afterward.

This page is general information, not individual medical advice. When in doubt, call.