Why Is Breast Milk Pink? Causes & When to Call a Doctor

Observing pink or reddish hues in breast milk can be unsettling for breastfeeding parents. While alarming, such discoloration is frequently benign and temporary. Breast milk naturally varies in color, from yellow colostrum to white, creamy, or clear mature milk, but can occasionally take on a pink or red tint. Understanding the reasons behind this change can help alleviate concerns and provide clarity on whether further action is necessary.

Understanding the Causes

One frequent reason for pink breast milk is small amounts of blood, often from cracked nipples. Breastfeeding can lead to abrasions or fissures on the nipple and areola, allowing minor bleeding to mix with the milk. An improper latch can contribute to nipple damage; addressing the latch often helps in healing these fissures. Once nipples heal, the blood discoloration typically resolves.

Another phenomenon, common in the initial days postpartum, is “rusty pipe syndrome.” This occurs when blood from increased breast vascularity and engorgement seeps into the milk ducts as milk production begins. The milk can appear brown, orange, or rust-colored, resembling water from an old pipe. This syndrome typically resolves within three to seven days after lactation begins and poses no harm to the baby.

Inflammation or infection of breast tissue, known as mastitis, can also cause blood-tinged milk. Mastitis often presents with pain, swelling, redness, a feeling of warmth in the breast, and fever. Bacteria can enter milk ducts through cracked nipples, leading to infection and potentially causing blood to appear in the milk. While mastitis requires medical attention, continuing to breastfeed from the affected breast is often recommended to help drain milk and aid recovery.

Small, non-cancerous growths within the milk ducts, called intraductal papillomas, can also cause bloody nipple discharge. These benign tumors are typically located near the nipple and can lead to clear or bloody discharge, often from one breast. Medical evaluation is advised to confirm their nature and rule out other conditions. The bleeding is usually painless, but persistent bleeding warrants professional assessment.

In rare instances, systemic conditions or certain medications might contribute to blood in breast milk. Additionally, the bacterium Serratia marcescens can produce a reddish-pink pigment, potentially discoloring expressed milk or pump parts. This discoloration is more noticeable in milk or equipment left at room temperature. If observed, especially in expressed milk, consult a healthcare provider to ensure the milk’s safety for the baby.

Impact on Baby and Mother

Small amounts of blood in breast milk are generally not harmful to the baby. Babies can safely consume blood-tinged milk, and it typically does not affect their health or digestion. Occasionally, babies who ingest it may have dark or black flecks in their stool or increased spit-up due to stomach irritation. These digestive changes are usually harmless, but discuss any concerns with a pediatrician.

For the mother, discovering pink breast milk can evoke considerable anxiety and worry. The unexpected sight of discolored milk can lead to concerns about the baby’s safety and her own health. Beyond the emotional aspect, the underlying cause, such as cracked nipples or mastitis, can cause physical discomfort or pain.

It is often recommended to continue breastfeeding if the milk is pink. Interrupting breastfeeding unnecessarily can lead to complications like engorgement or reduced milk supply. Most causes are temporary and resolve spontaneously or with simple interventions. The discoloration usually subsides as the underlying issue heals, and the milk returns to its typical appearance.

When to Seek Professional Advice

While pink breast milk is often benign, certain indicators warrant consultation with a healthcare professional, such as a doctor or lactation consultant. If the discoloration persists for more than a few days, especially beyond the initial postpartum period, medical evaluation is advisable. Persistent bleeding could indicate an ongoing issue.

Seek advice if there are significant or increasing amounts of blood in the milk. Large volumes or a sudden increase might signal a more serious underlying condition. Professional guidance can help determine the cause and appropriate course of action.

Accompanying symptoms in the mother also necessitate medical consultation. These include severe breast pain, fever, chills, a noticeable lump, or widespread redness and warmth, which can be signs of infection like mastitis. Any unusual discharge or changes in breast tissue, such as thickening, should also be promptly reported.

Although rare, if the baby exhibits unusual symptoms, such as persistent vomiting, lethargy, or a refusal to feed, alongside blood in the breast milk, seek immediate medical attention. These symptoms, while not directly caused by ingested blood, could indicate other health concerns for the infant.