10 1/2 might be a little early. It depends. Each baby is different. I think they say 12 mos because by then, in most cases, a baby's digestive system is ready to handle dairy.
Our daughter got a full 8 oz bottle of cows milk shortly after her first birthday. She was constipated the next day. We weren't sure if it was the milk, so we didn't give her any more until a few weeks ago and now she only gets one bottle that is half, though we're going to be making that 2 soon.
Have you called a his pedi and asked if they have a LC that works with their office? Many pedi's will at the least have an IBCLC they either work with directly or they can refer folks to. Most insurance doesn't cover them but some do. They should have some info or know where to point you.