Interesting, thanks for the help, I'm trying to figure out how to insert an image, one of the babies does look sort of deformed. I feed rodent block with "rat mix" (sunflower seeds, corn, etc) mixed in the bedding every change. I've had aprx 8 other females give healthy litters ~8 pups several times. The blocked canal makes sense. An interesting behavior I noticed was that she was "stealing" almost fully weaned pups from her roommates litter she had been living with for weeks before the birth. I keep no more than 3 females per cement tub and 1 male to cycle through them