Lactose intolerance is due to an inability to digest the lactose [which is a natural sugar] in milk. It may last for many years or even be life-long.If you give him milk he will develop symptoms such as diarrhoea, abdominal discomfort and windiness if he is still lactose intolerant. An allergy is due to the immune system building up antibodies to milk, this usually manifests as skin rashes such as eczema.
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