Like KritterCare said, if you plan to breed your gliders, you should DEFINITELY have a joey rejection kit ready. I've only been a member for a little while, but I've already seen multiple threads about joeys dying, because they were rejected and the owner wasn't prepared with a joey rejection kit. Also (although I know very little about glider pregnancy and breeding), I know when gliders have a joey in their pouch, they have different nutritional needs. I think part of it is them needing more protein. But I'm not sure how much more or what, if any, other nutritional needs pregnant gliders have. You should definitely research that stuff or ask experienced members on here about it before breeding happens.