This. Each day they survive their prognosis goes up exponentially.
But to reiterate, don't pack them into too small of a brooder Easy Bake Oven size. Start with the light low and raise it a few inches each week. Make sure they have enough room to escape the heat altogether, they really are smart enough get close when they are cold and move away when they are hot, the key is to have enough room to move away.
