A 2-month-old previously healthy infant is admitted for seizures.

This infant presents withhyponatremia and seizures, but without signs of structural neurologic abnormalities. In formula-fed infants,excessive water dilution of formulais a common cause of hyponatremia. The first step is toevaluate feeding practicesfor possible over-dilution leading to water intoxication.

“In infants with unexplained hyponatremia, especially formula-fed, assess for over-diluted formula. Water intoxication can cause seizures without infection or anatomical findings.”

(Referenced from CCRN Pediatric – Direct Care: Endocrine, Electrolyte Imbalances in Infants)