Goat's milk is the closest to human milk and it is wonderful. A bit more expensive but well worth it. The thing is to look for a farm where they can sell the raw milk to you and you bring it home, boil it for one minute only and then put in the frig what is enough for 3 days. Freeze the rest in small bags and then take out as needed.
Cow's milk is for baby cows and soy milk is not fit for anyone. The better choice is fresh raw yogurt. If I want milk to cook with or make smoothie's with use almond milk, that you make yourself.