Ohhh, this is something I know about.
I HAVE DONATED BREAST MILK! When I was breastfeeding I was told about babies with special needs and mothers who can't supply milk, and so I donated a few pints. They gave me a pump.

What I find creepy is when I go to my friends house and her seven year old son thinks nothing of lifting her top and latching on.
They know it freaks me out, and so they giggle at my shudders.
That makes it worse somehow.