My sister was born premature during WWII and she could not tolerate milk. Doctors told my parents they could do nothing and she could not thrive, sent her home not expecting her to live. Told my parents to just love her until she passed.
My dad and grandfather were raising sheep and had Basque herders working for them. One of the older Basque men told my dad to feed her fresh goat milk right out of the goat and not add anything. It worked! My dad or mom had to literally milk the goat for each feeding for her but she not only survived she thrived on it. She did have some respiratory and other issues from being a preemie but the feeding issue was solved.
My mother said the doctors were amazed and called her a miracle baby, yet did not start recommending goat milk for other babies. My mother never understood why goats milk was not promoted here especially for children.
I know people who raised their kids on goat milk because they could not tolerate anything else as infants, even the formulas etc.