For young baby and teenage buns, I would stick with unlimited alfalfa and unlimited pellets for the time being. They need the extra energy and calcium for their bones to grow.
Perhaps save the introductions of veggies and fruits when your dwarf is older. And when your dwarf is old enough, introduce veggies and fruits very slowly one-by-one, so you can monitor how well their systems take it (by looking and inspecting their poops). Carrots, green peppers, and fruits are good ideas for treats because of the high sugar content (perhaps once a week; and again introduce very slowly and one at a time). [Edit: Fruits and other sugary items should be in low doses; general rule that I use is no more than the tip of your thumb for sweets.]