Breast Milk Color: What Yellow, Blue, Green and Pink Milk Mean

Most people expect breast milk to look like cow’s milk. Then they pump for the first time and see golden yellow, watery blue-white or, occasionally, a startling pink. Breast milk comes in more shades than you might think, and most of them are completely normal.

Here’s a color-by-color guide to what you might see, what usually causes it, and the few colors that mean it’s time to call your doctor.

Breast milk color at a glance

Color	Common causes	Usually normal?
Deep yellow or orange	Colostrum; carotene-rich foods; frozen milk	Yes
White or cream	Mature milk, especially later in a feed	Yes
Clear or bluish	Thinner milk, often early in a feed	Yes
Green	Green foods, drinks, herbs or seaweed	Yes
Pink or pink-orange	Food dyes; a little blood; rarely bacteria or a medicine	Check with your doctor
Red, brown or rusty	Blood from nipples or ducts; rusty pipe syndrome	Check with your doctor
Black	Rarely, the antibiotic minocycline	Talk to your prescriber

Yellow and orange milk

Colostrum

Your first milk, colostrum, is often thick and deep yellow or orange, which Cleveland Clinic compares to the yolk of an egg. The color comes from carotenoids and vitamin A. It can also look clear, white or creamy, and all of these are normal. Colostrum lasts for roughly the first few days after birth, then gradually changes into transitional and mature milk over about two weeks. Our guide to when breast milk comes in explains these stages.

Later on

Mature milk can still look yellowish. La Leche League International notes that eating lots of yellow-orange vegetables like carrots, squash and yams can raise carotene levels in your milk, which is harmless to your baby. Frozen milk often looks more yellow too.

White, clear and bluish milk

La Leche League says the composition and look of human milk change through the day and even through a single pumping session or feed, and that milk may be white, yellow, clear or have a blue tint. Thinner milk can look clear or slightly blue, while fattier milk looks whiter or creamier. Both are normal variations.

Green milk

Green milk is almost always about what you ate or drank. La Leche League International links it to green sports drinks, seaweed, herbs and large amounts of green vegetables like spinach. It isn’t harmful and fades as the food or drink passes through.

Pink, red or brown milk

This is the color group that most often worries parents, and it has several possible causes.

Food dyes

Brightly colored sodas, fruit drinks and gelatin desserts have been linked to pink or pink-orange milk. If the color appears after one of these and you have no other symptoms, this may be the reason.

Blood from cracked or damaged nipples

The most common cause of pink or streaky red milk is a little blood from cracked or damaged nipples. Your baby may swallow some and spit up milk with brown or red flecks. Cleveland Clinic suggests seeing a lactation consultant or breastfeeding medicine specialist, who can look at your baby’s latch and your position, because small changes can help ease nipple pain and bleeding. See our guide to sore and cracked nipples.

Rusty pipe syndrome

In late pregnancy and the first days after birth, some people see brown, rust-colored or blood-tinged colostrum. This is often called rusty pipe syndrome. La Leche League International explains that extra blood flows to the breasts and sometimes leaks into the ducts, that it should clear after a few days as more milk flows through, and that it’s fine to keep feeding your baby. A case report and review of the literature (PMC) found that most cases clear within about seven days without treatment, with one report of 10 days, and that it is usually in both breasts and painless. If it lasts longer than that, your doctor may want to look for other causes.

Engorgement, mastitis and other causes

Cleveland Clinic lists other causes of pink milk: small blood vessels breaking when breasts are very engorged, bacterial mastitis, and benign growths in the milk ducts (intraductal papillomas). Breast cancer is a rare cause. Some uncommon medicines can also turn milk pink.

Serratia bacteria: bright pink milk and stains

Rarely, a bacterium called Serratia marcescens grows on the nipples or on poorly cleaned pump parts and makes a bright pink pigment. Cleveland Clinic says you may notice pink stains on towels or your bra, and case reports describe pink stains on cloth towels used during breastfeeding. The bacteria can be harmful to young or premature babies, so it needs a doctor’s assessment. Cleveland Clinic says antibiotics may be prescribed for a Serratia infection on the skin, but not if the bacteria are only growing on pump parts. La Leche League International says returning to breastfeeding is safe after cultures from both you and your baby are negative.

Can I keep breastfeeding if there’s blood in my milk?

The two sources differ here. La Leche League International says blood in milk is not harmful to babies, that you can continue breastfeeding, and that in most cases it stops within a few days. Cleveland Clinic says most causes are harmless but advises you to call your provider any time your milk looks pink, to wait to give the milk to your baby until the provider says it’s safe, and meanwhile to pump and store it. A quick call helps sort out which situation applies to you.

Black milk

Black milk is very rare. NIH LactMed notes that black discoloration of breast milk has been reported with the antibiotic minocycline, in case reports where black, iron-containing pigment was found in milk. If you’re taking it and notice dark milk, talk to your prescriber or pharmacist. Our medicines and safety hub explains how to look up a medicine while breastfeeding.

Stored milk that looks or smells different

Thawed milk often looks more yellow and separates into a cream layer and a thinner layer. Both are normal. If thawed milk smells soapy or metallic, see our guide to high lipase milk.

When to call a doctor or lactation consultant

Call your doctor if:

• Your milk looks pink, red or brown and it isn’t clearly from a food or drink
• Blood in your milk lasts more than a few days (La Leche League says it usually stops within a few days)
• The pink or bloody milk comes from one breast only, or you feel a lump
• You see bright pink milk or pink stains on pads, bras or diapers
• A breast is red, hot and painful, or you have a fever
• You notice dark or black milk while taking a medicine

Call your baby’s doctor if you see blood in your baby’s spit-up or stool. And see a lactation consultant (IBCLC) for cracked or bleeding nipples, so you can fix the latch and heal. For more on handling and storing your milk, visit our breast milk storage hub.