Hyponatremia, the medical term for low concentrations of sodium in the blood, can cause seizures, coma and death in severe cases.
Doctor Orwais Durrani, rang the alarm after seeing a rise in lethargic babies showing up to emergency rooms.
He told Insider: “A formula is essentially regulated as closely as any prescribed medication when it comes to the ingredients it to make sure a baby’s kidneys are developing, their liver, their electrolytes – everything else is in a very fine balance.
“They’re not as resilient as an adult who might be out in the sun for 12 hours and get dehydrated – we’ll still be OK for the most part, but for a baby, that’s not the case.