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.
How to create an underscore. Creating the _ symbol on a U.S. keyboard. To create an underscore, hold down the Shift key and press the  -  (hyphen) key to the right of the 0 (zero) key on the top row of your keyboard.