In China, 10.03% of babies have primary lactose intolerance, while 53.97% of them have secondary lactose intolerance(often happens after gastrointestinal disorders). But baby can't live a life without milk...
Lactose is a common ingredient in breast milk. Lactase breaks it down into galactose and glucose.Lactose intolerance is caused by a lack of the enzyme lactase, which can't break down lactose into half undigested lactose. When lactose enters the lower reaches of the intestinal tract, it will be broken down into gas by miscellaneous bacteria, leading to diarrhea.