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What color should breast milk be?

Aligned with CDC guidance; not medical advice · Updated July 2026

Quick answer: Anywhere from golden yellow (colostrum and transitional milk) to bluish white (mature milk), and diet can tint it green (leafy vegetables, food dyes) or orange. Pink or rust-tinged milk usually traces to a little blood and is often harmless, but persistent blood or brown milk deserves a call to your provider.

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Pink or rust ("rusty pipe syndrome") often comes from tiny broken capillaries in the early weeks and typically resolves alone; small amounts of swallowed blood are not dangerous to the baby. Call your provider if blood persists past a week, if milk is distinctly brown or black (some medications cause this), or if color changes come with pain or fever.

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