M.,
I'm a nutritionist and a huge fan of goat milk. Goat milk is truly the 2nd best thing to breast milk for an infant and child. It's much easier to digest than cow's milk, and is less likely to be contaminated with growth hormones.
Typically, the goat farms are run more ethically. I highly recommend you start your toddler on RAW goat milk if you can. You'll have to find a local farmer (such as the Amish) or have it shipped from a farm up north. Here is a site with lists of farmers who will ship you Raw dairy.
http://www.realmilk.com/where.html
If you want to read the benefits of Raw dairy, check out my website summary:
http://www.rockwellnutrition.com/Millers-Organic-Farm_ep_...
On a personal note, my baby (now 11 months) is still allergic/intolerant to cow dairy formula of any type. It's just too hard to digest since the cow dairy protein is 10x larger than human milk, and the homogenization/pasteurization process kills all the enzymes which help break it down. As a result, many people have trouble with cow dairy. And if they don't right away, the body usually "gives up" trying to digest it after a while. It takes a lot out of your system to digest cow milk's large protein molecules.
My baby does great on goat milk and it's so nutritious. It's truly the second best thing to breast milk. If you get the raw goat milk, it has no smell and it does not rot like pasteurized kind. It "sours" instead like yogurt. Just delicious!
If you'd like to add in some Essential Fatty Acids and vitamins to the milk for added benefit, here are the supplements my clients and I are using for our babies:
http://www.rockwellnutrition.com/Formula-Fed-Infants_c_24...
Best wishes!
A. R.,
Certified Nutritionist