Over the past 80 million years, not much has changed with the basic biological function of breast-feeding. The only thing that's really changed is the debate about breast-feeding vs. formula. (For the record, I know what matters is that each mom makes the decision that's best for herself and her baby.) I'm a dude, so I didn't know about a lot of this stuff. There's some really cool information about breast-feeding, formula, different types of milk, and some of the debates surrounding breast-feeding.