Red breast milk indicates that blood is present. This isn't usually a cause for concern and there is no reason to throw out your affected breast milk!
Red
Green breast milk may be the result of eating green foods such as dark leafy greens or foods that contain green dyes.
Off all colors, why blue? When your milk becomes more mature, you are producing both foremilk and hindmilk.
Another form of mature milk is hindmilk. Hindmilk is what baby gets after foremilk.
Colostrum is usually thick in consistency and dark yellow or orange in color. This is the first milk your body begins to make.
Transitional milk is what your body begins to produce after colostrum. Your breast milk goes from dark yellow to white as your milk comes in.