H.S.
Hi J.
Yep, that soy milk should be fine. I am a Registered Dietitian and only give my 14 month old son Silk Soymilk. The only thing I don't love about soymilk is that usually it is sweetened. Silk brand does sell an unsweetened version and I usually mix the plain (sweetened and unsweetened) together 50/50. The only question I had was whether there was enough fat in the soymilk for healthy brain development (the reason that whole dairy products are recommended until 2 years old) and my pediatrician told me that yes, there is enough fat in the soymilk.
You are also the person who posted the question about the Mom's club right? Where are you from? :)