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If it were my grandaughter, I would go to the doctor with her mother or dad and start asking questions like please do a sonogram on her bladder and kidneys or an MRI or cat scan - anything that will show up problems. It could be that something just needs to be corrected. I have heard of children being born with too short of a tube from the bladder or kidney and it will cause more frequent urinating. Also, you want to know if there is a cyst or tumor problem.