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Kittens are baby cats that are not yet fully-grown. Kittens are born after 64-67 days in their mother's stomach. Two to five kittens are in a litter. Kittens can't keep their body temperature for the first 3 weeks and can die if not keep warm by their mother. That's why it's illegal to give away kittens younger than 8 weeks old.
information from : http://en.wikipedia.org/wiki/Kitten
information from : http://en.wikipedia.org/wiki/Kitten