Permanent neonatal diabetes mellitus (PNDM) is a rare type of diabetes and KCNJ11 gene activating mutation is one of its prevalent causes. We introduced a 4-month-old male infant with poor feeding, restlessness, tachypnea, hyperglycemia, metabolic acidosis, and ketonemia. He was discharged with insulin and after 2 months, KCNJ11 gene mutation was found and treatment was switched from subcutaneous insulin to oral glibenclamide. Now, he is 1 year old with desirable glycemic control; therefore, genetic study is recommended for KCNJ11 gene mutation in such patients because if the mutation is found, treatment can be switched from insulin to sulfonylurea.
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