Lactose intolerance in general and in children in particular has many causes. One of the biggest causes is a deficiency of the enzyme Lactase in the body. Lactase is an enzyme produced by the body in the small intestine that helps the body digest and break down Lactose consumed from milk. According to statistics, most infants are born with the ability to absorb Lactose, but 75% of the global population experiences a decrease in the enzyme Lactase from about 2 years old to 12 years old.