Hello amanda, yes, we can make kid's size, but most of the costumes are made of polyester, not cotton; if this is okay, please just click & choose your favorite costume and choose the size (both standard size & custom size are available). n_n
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How to order custom size?We include free shipping (Hong Kong Post, 20-30 days shipping time) worldwide, except Vietnam. And you can pay extra cost to upgrade faster shipping method. [*All shipping information (methods, cost & estimated delivered date) will be shown in order page, before payment.]