When he can find the food and drink. That is the only thing stopping you. If He is on pin heads and isnt cup trained, welp no big cage for you. On the other hand if he is up to 1/2-3/4 in crickets and you can rig up the bottom of the cage so they cant hide under things, you are good to go. i will put mine in the 2x2x4 cages as soon as they are cup trained, its like a free range for babies.