handling from a young age is a no brainer,but no matter how much you handle them they will push there luck as all young animals do ,ive had ferrets 30 yrs now and ive always done the same routine.loads of handling from very young,ive let them nip away till they around 4 wks.after that I start putting my finger into there mouth,not to make them sick or anything but they don't like it and association with my hands in their grip is that nice. I also give them them occasional flick on the nose with my finger when the nip too hard ,all this in my experience is teaching my kits that overstepping the