True allergies to cow's milk are relatively uncommon. Only 2 to 3 percent of children are allergic to milk, according to the AAP, and almost all of them outgrow it by age 3. (Learn the difference between a milk allergy and lactose intolerance .).
The underscore [ _ ] (also called underline, underbar, low line, or low dash) is a character that originally appeared on the typewriter and was primarily used to underline words.
Underlined text is often used in the middle of sentences indiscriminately as a way of providing emphasis, sometimes in superfluous addition to italics and boldface. Even when a discerning individual attempts to use the underscore correctly, he or she often ends up applying the attribute to a word or phrase that does not require an underline.