My glider was making some soft squeaks when he was in his pouch earlier today. He seems comfy and nothing wrong, I had just never heard this before from him. What could this be?
It is hard to definitively say without hearing them...but, most likely it is the contented clicks they make when they're comfy and happy. We call it purring. It's a wonderful sound!
It does seem likely to be a happy chirp sound or purring as already mentioned. If you check this link below out, maybe you can identify the sound better