1. XS - Kitten : (less than 6 months old about 5 pounds / 2.5 kg)Soft Cat Nail Caps will fit most kittens by the time they reach the age of 16 weeks (4 months). Some kittens can wear them as early as age 12 weeks (3 months). To test, try a nail cap on first without the adhesive. If it looks too big,..