Quoted: Just like adults, babies and toddlers who are lactose intolerant lack the lactase enzyme. When this occurs, “the lactose travels through the stomach into the gut undigested and causes fluid to move from the gut tissue into the gut itself, which causes cramping, nausea, abdominal pain and diarrhoea,” Dr Mark Moss, a paediatric allergist at the University of Wisconsin Hospitals and Clinics, told The Bump.
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