For a nine year old, this is complicated. Goat's milk is milk, and though it's easier on the human body than cow's milk, it's still milk, so the question is why milk is being discontinued. A lactose intolerant person might very well still be lactose intolerant to goat's milk, for example, but someone who has digestive problems with cow's milk might not with goat's milk. There's also a taste issue.