A little earlier than I was referring but I think they just steadily improved practices of infant feeding over time because there was significant mortality associated with «artificial feeding,» though it was less the milk itself (my husband says they traditional gave goats milk to babies whose mothers couldn't feed them), than the practices associated with delivering non-human milk to infants (e.g., dirty bottle teats, spoiled milk). (skepticalob.com)
However, the proper cleaning of baby bottles is extremely important, as babies» immune systems have not fully developed, making them much more susceptible to getting sick from bacteria in dirty bottles. (wikihow.com)
Hand them a baby, or a dirty bottle, or a diaper pail that needs changing. (twiniversity.com)