To determine the age of a kitten:

1. Umbilical cord. If you see a kitten and the umbilical cord has not fallen off, it should be no more than three days old.

2. Eyes. Generally speaking, kittens open their eyes in about 10 days, which is an average number.

3. Ears. When newborn, the ear canal is closed. It begins to open on the 5th to 8th day, and can stand up around 15th to 20th day.

4. Teeth. The order of teeth eruption is generally: incisors (10-15 days), canines (15-25 days), molars (30-40 days).

The growth stages of cats:

1. Newborn cats refer to newly born cats. They are very delicate and need to be taken care of for any daily behavior and cannot take care of themselves. .

2. The kitten stage refers to the stage from birth to weaning. At this time, the cat will open its eyes to see the world, be curious about everything, and must rely on the care of the female cat or humans.

3. The kitten stage refers to after weaning to about one year old. Cats in this period are the most curious and lively in their lives and will learn all the skills and lifestyle of cats.

4. The adult cat stage refers to cats between one and ten years old. This stage is the longest and is also the most important life stage of the cat. During this stage, the task of breeding and all the chores of life are completed. Cats during this period are most alert and alert to their surroundings.

5. The aging cat stage refers to cats over 10 years old. At this stage, the cat's body functions have deteriorated and it is no longer active and needs careful care from its owner.