Kittens are the young of the house cat, Felis domesticus, and are usually very playful, and are very lovable if raised in a good home. Once a kitten becomes a year old, it is no longer considered a kitten, and is considered an adult cat. Their color as an adult cat is often the same as the color as a kitten.
They are very small, about 3-4 inches and 3 1/2 ounces. Their eyes are not open at this time, and they cannot urinate or decafate on their own, needing their mother to give them a rub in the anal area to simulate excretion, which newborn kittens cannot do on their own until they are 2-3 weeks old. They should not be over-handled, especially in the first week of life. They can taught to use a litter box at 4 weeks old by putting them in the litter box after a meal.
At this age, they can run well and are difficult or impossible to catch. Windows should not be left open, so the kitten will not jump out and fall, which could possibly break its bones or kill it. They usually weigh about one pound at this time and are about 6 inches long.