Preserving beta cell function

My son was diagnosed a few weeks ago, one week before his third birthday. As with most, he’s still producing some insulin and I am trying to find out if there are any treatment options to preserve that function. I keep reading about the ability to preserve it with “aggressive treatment” of the newly diagnosed, but no specifics as to what that treatment is or how to get it. Anyone have any information? We live in Bozeman, MT so resources or options nearby would be best.