Hi I have 2 kit hobs/ baby males one is 9 week old and one is 8 week old. the 8 week ols is tiny and the 9 week old is huge. 8 week old is slightly bigger than my hand and 9 week old is nearly length of my arm. I am wondering if the 9 week old is infact older. he got testicles last week how old would a ferret have to be before they appear?