they dont. they are usualy half and half. but it depends on the doe and the time of year, its weird. winter time small litter=HUGE BABYS, summer time= large litters half small half HUGE.i would post pics but i dont have any uploaded to my computer yet.Those are small does, considering that the minimum weight is 3 1/4 for a doe. Sounds like your does are true dwarfs; I wonder why they seem to only have false dwarf babies?