B.M.
Hi N.,
We don't use cow's milk at all. My 4 year old has a dairy allergy, so we use soy. We never even attempted it with my 19 month old because of the risk of another child with the allergy.
Some people think that "cow's milk is for baby cow's." There are several proteins in cow's milk that humans cannot digest.
There is a lot of controversy about the phytoestrogens in soy. Don't let it scare you. Plant estrogens and human estrogens are 2 totally different things. It has the same name, but they are not the same.
I have a background in nutrition and feel very confident that giving my children (and myself) soy is quite healthy.
My husband also likes the taste of rice milk (I don't), so that may be another option.
There is definitely less fat in both soy and rice milk, so if you choose either of those options after he turns 1, you will be just fine.
B.