Why is my cat not growing ?

I have a female cat that i had for a year and 2 months ... When she was little she looked like a ball ... But she grew really fast at that point but now she still look like a kitten .. she is very small .. And I have 2 other cats so I know that she isnt suppose to be the size that she is now ... What is wrong with... show more I have a female cat that i had for a year and 2 months ... When she was little she looked like a ball ... But she grew really fast at that point but now she still look like a kitten .. she is very small .. And I have 2 other cats so I know that she isnt suppose to be the size that she is now ... What is wrong with her ?
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