Babies’ bodies produce lactase so they can digest milk, especially breast milk.
Premature babies may suffer from lactose intolerance. Children who are lactose intolerant and were born at full term usually do not show signs of lactose intolerance until they are at least 3 years old.
Lactose intolerance starts at different periods of life. In Caucasians, those with the disorder will show symptoms after age 5. However in African Americans, it usually occurs as early as age 2.
Lactose intolerance is more common in people with Asian, African, Native American, or Mediterranean ancestry than it is among northern and western Europeans.
It is generally common in adults but is not lethal. For example, about 30 million American adults develop some amount of lactose intolerance by age 20.
*Sidenote
People sometimes confuse lactose intolerance with cow milk allergy.
Lactose intolerance is more common in people with Asian, African, Native American, or Mediterranean ancestry than it is among northern and western Europeans.
It is generally common in adults but is not lethal. For example, about 30 million American adults develop some amount of lactose intolerance by age 20.
*Sidenote
People sometimes confuse lactose intolerance with cow milk allergy.
There are differences between these two incidents, like milk allergy is a reaction by the body's immune system to one or more milk proteins and can be life threatening when just a small amount of milk or milk product is consumed, unlike lactose intolerance as its symptoms are not fatal. Milk allergy usually will occur during early stages of life, while lactose intolerance occurs more often in adulthood.
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