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.
Typing an underscore is the same for a Windows or a Mac computer. On most standard keyboard layouts, the underscore shares a key with the hyphen character. Type it by pressing the Shift and H** yphen** keys.