It is very possible that your baby is either allergic to cow's milk or has a problem known as lactose intolerance. As a start change his formula to NAN HA or even better try to only breast feed him.If his diarrhoea continues then he probably has a lactose intolerance problem and will need to go onto a lacose free formula such as NAN LF. As breast milk also contains lactose he will have to have the lactose free formula only.
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