i'm sorry, i didn't mean to be rude, sometimes it's difficult to get intonation across in writing. you are keeping two rescue chinchillas together not knowing what sex they are. they could be a couple. if they are, they will breed. you have no idea of their history. sometimes, a bit of stress can prevent a lot of heartache in the future.
i am not a breeder. however, i did raise four kids. these were accidental - i had two 'male' chins, the one that turned out to be a girl was sexed by two breeders as a male. by the time i found out she was a girl, there were three little babies and she was pregnant with the fourth. my boy was neutered and died two months later following a reaction to the anaesthetic during the a surgery he needed following the complications he developed after his neutering.
the first litter were triplets and fluffy had mastitis. this meant that i had to force feed three kits - one of them who was absolutely refusing to try and survive - get fluffy's mastitis better and manage chinchi's infection. i got about three hours of sleep in the first week. now fluffy has teeth problems and i am absolutely terrified that it could be genetic and hence some or all of the kits could be affected.
my question why you wanted to breed was asking what your interest in breeding is. different people breed for different reasons.. shows, perfecting colours, some people breed just to sell. i do not harass people. if you go through other posts i have written, you'll find out i'm actually trying to be helpful.