dumb question but, did you remember to feed the mice before/ after giving birth? we had an incident with asfs as to where we didn't feed them for 1 day after they gave birth and when we looked in the rack they had eaten all the babies. just a thought.. as for it being normal for them to have just one, i guess its plausible, but not common.
There's many reasons as to why you could have only one pinkie. My mama had 12 in her litter, and ate only one. If you breed her again and notice the same thing, she's probably eating them, and should be fed off.
0.1 Dog (Truffles)
0.1 Cat (Dutchess)
1.0 Hamster (Pumpkin)
1.1 Bumblebees (Satyana & Weedle)
1.1 Normals (Shayla & Rita)
0.1 100% Het Pied Ringer (Avalon)
1.0 Pied (Monsieur Piederoff)
1.0 Lesser 100% Het Albino poss het OG (Tinersons)
1.1 Normal BCIs (Damon and Conga)
0.0.1 Rosehair Tarantula (Charlotte)
Pretty sure she ate them... She's in a colony of 1.3.. I looked today to check on the pinky... gone... Wonder why they are being eaten? No idea how to identify which one is the one whos doing the eating though..