Edit: To clarify, I’m asking about human babies drinking human breast milk.
In: Biology
There’s a misconception here, which is that stuff you drink becomes pee and stuff you eat becomes poop. Actually, pee and poop are created through very different processes.
Pee is generally filtered out from your blood. Water gets absorbed and excess water gets excreted, and with it, all the stuff your kidneys filtered out of your blood. Poop, on the other hand, is what’s left after you digest your food (as well as other stuff in your digestive system). Stuff gets absorbed and the stuff that *doesn’t* get absorbed gets pushed out the butt.
Well, when a baby drinks milk, some of that milk is absorbed and some isn’t, and the part that isn’t becomes diaper filler. Part of it is milk solids; part of it is not actually solid at all; part of it is stuff excreted from the digestive system itself.
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