Just enough to fit them curled into a ball. I have a 3 month old and this is the one I got her http://www.exo-terra.com/en/products/reptile_cave.php in the medium size which is the second one from the left. You want it them to fit into it and have a bit of space but not too much. Think security. As they get older you'll obviously have to upgrade but that one should last the next few months.








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