You can determine a kitten’s age by examining some of their features.
If a kitten still has their eyes closed, they are probably younger than ten days of age.
If they are already walking and playing, it is very likely that they’re older than four-weeks-old.
If the kitten is in good body condition, you can safely say that their weight in pounds corresponds to their age in months. If they weigh two pounds, the kitten is eight weeks. Note that this trick only works until the cat has reached five months of age, as they will gain weight at a steady rate.
If you can already spot adult incisor teeth, the cat is older than four months; if you spot adult canines, premolars, and molars, then you’re dealing with a cat at least six-months-old. If they already have all their adult teeth present, then they are older than seven months. These parameters only apply to normal, healthy cats.
If you notice sexual-maturity behavior, such as loud meowing and urine spraying, then your kitty should be older than four-months-old, as this is when they reach sexual maturity.