We've had our 2 girls for 8 weeks, they were 10 weeks when we got them, they're sisters.
never have i heard them make a noise but one of them has had a real squeal this evening, i can't tell which one because they were wrestling with each other like they frequently do, is one,hurt or were they fighting properly? They don't appear to be ill or in distress and are both quiet and snuggled up together now.