Most of my babies have been put on med mice right out of the egg. Pinkies are never an option for me unless I have a stubborn eater. I did have a friend who got twins in an egg and they were so so tiny that a rat pink made a full belly. But for normal hatchling full grown mice can be eaten. For anything older go with rat weanlings or mice. Prey has to be moved up according to size of the snake.