My cat was 1 hand big he was about 3weeks to a month 2 hands 2-3 months 3 hands 5-6 months at 1 year and about 3 month he was 5 hands long (on hand side to side or about 4 in) but cats can vary in sizes that's just according to the size of my cat
How Do You Tell How Old A Kitten Is?
Guess... eh he is 1 1/2.
Measure it.