Good point - the assumption. You cannot feed cow's milk to infants? My memory of ancient practice was, if the mother cannot nurse, they used another lactating woman. Two-year-olds shouldn't need to nurse, should they?
No two year olds shouldn’t need to nurse.
Babies handle most foods by the time they are one.
However I could see these bottles used as a type of sippy cup or what have you for a while.
Give a newborn cow milk and they will usually be in great distress and probably eventually die through diarrhea and malnutritin. They can’t digest it properly if at all.