Why isn't my cat growing?

My cat is a Calico [Female] And she isnt growing. she is not really tiny but she is small. i've had her for a while and she eats alot but she isnt growing. My dad thinks shes a "Dwarf species" but im not sure if that is real. I could use some help???
Update: My cat is about 7-9 months old [i dont remember] and her head is small too. very small. I thik shes cute how small she is but i just dont even have an idea of why she isnt getting any bigger.
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