Goat's milk was the historical alternative, since it's a close match. We don't have a lot of goats, nor a lot milking of them. But my wife's grandfather was in

Goat's milk was the historical alternative, since it's a close match. We don't have a lot of goats, nor a lot milking of them. But my wife's grandfather was in fact fed on goat's milk when he was young. Cow's milk is absolutely inappropriate [1]: it has way too much protein for babies and the wrong nutritional profile - even when they start being able to drink it you have to be careful about how much since they're not great at digesting it yet. It's missing all sorts of things - i.e. not enough iron. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4882692/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4882692/