Offer a baby veiled as much as he wants!
15 to 20 appropriately sized crickets per day is not an unusual amount.
There is no reason to mess with fruit flies at two months. He probably wants some greens at this age. I use well washed collards (high in calcium) and be careful with over dusting. Once a week is fine and twice a month with vitamin supplement. If you are gutloading your feeders with good food and offering greens, there is no need to add a bunch of supplements. Too much dusting is overkill and can possibly be harmful.