I know this happens to a number of moms- anyone know why??

It didnt happen to me until a couple weeks ago and it was pretty green when I was pumping! DH looked it up and said a diet high in greens will do it, I had a green smoothie for breakfast and a big leafy green salad for lunch so that added up. But I don't think it's diet related cause my sisters friend has green breast milk and eats mostly processed foods and never eats salads!

Anyone else?

Oh I should say it doesn't happen consistently, however I'm not pumping daily either.