Hey there, two of my adult female rats got pregnant just about at the same time. I pulled them from their 1.3 group and set them up in a tub together. The first mom gave birth to 18 pups and four days later the second mom gave birth to 7 pups. I fed two of them off that day but when I did a baby count today I found I was only down to 14 pups and all of them were from the first litter. What should I do? Does this happen often? The moms were only housed together as adults and hadn't spent a good deal of their life together. Any advice is appreciated.