Thank you for the chance to reply to Dr. Skinner's letter. The problem he cites, hyperosmolality due to powdered milk being diluted insufficiently, is certainly more common than the one we cited where water intoxication resulted from making milk too dilute. In a similar way commercial electrolyte solutions apparently were associated with development of hypernatremia in diarrhea.
Dr. Skinner's suggestion to the manufacturer seems to be reasonable and I would endorse this.