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.
Age
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Newborn
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They are very small, about 3-4 inches and 3 1/2 ounces. Their eyes are not open at this time, and they cannot 
A newborn kitten
6-8 weeks
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At this age, they can run well and are difficult or impossible to catch. Windows should not be left open, so the kitten 
6-8 week old kitten