At that age then the more milk the merrier! If you are worried about bloat put a bit of gripe water in the milk as you are mixing it. if you sprinkle a tea spoon of milk powder over the creep the lambs start on it a bit sharper since it smells like their normal diet. All the best with her, wee have 13 orphans just now, can't wait till they are all on creep and not needing milk!