Chin too thin?? Please help!

Okay so I have a lot of chinchillas. Backstory, we adopted two chinchillas who had not been cared for properly by either sets of previous owners. (Yes, these poor babies have had two different sets of bad past owners. This is why I took them immediately) All we knew about them was that 1 of them was 1 year-old, the other was almost 2 years old. They were not related, and they were both males and caged together.

Two weeks later. One of my "males" popped out two babies while we were asleep. I...

Chin too thin?? Please help!