I'm a NICU RN and a Lactation Consultant, La Leche League Leader. I've never heard of bright pink spit up - except for a baby who has been given a medication. Since these parents seem to be "naturalists", maybe they are giving some kind of herbal or natural supplement - I would ask that specifically. There are enzymes in breastmilk that can change how it looks/smells, but I have never heard of pink? I see the parents point on the tap water, maybe they are concerned about child getting enough flouride. But it would be worth it to try bottled water for a couple weeks to see if it is the water source. The bottled water won't have lasting effects if used for a few weeks.

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