For those who don't know, you can not age kits by size since that varies and is mostly food dependent at young ages. Here is how you age kits: Average Dental eruption ages (L = Lower, U = Upper for this chart, C canines which are the conical teeth, P = premolars which are the teeth between molars and canines, M = molars which are the more flattened teeth at the back of the mouth, number start toward the front for each type, 49 days = 7 weeks = , 56 days = 8 weeks, 63 days = 9 weeks, 70 days = 10 weeks, 77 days = 11 weeks; you can do the approximate month ages.) Day Week Teeth 50 7 UC, LC, LM1 53 7 and 1/2 LM1 60 8 and 1/2 UP2, UP3, UP4, LP2 67 9 and 1/2 LP3 74 10 and 1/2 LP4, LM2 That is the only reliable way to get the approximate ages of kits. If those teeth are breaking through it's the approximate age. (Source: _Biology and Diseases of the Ferret_) [Posted in FML issue 3732]