As a parent, do you often find yourself asking your teenagers to remove their headphones so you can speak to them? You may want to consider doing it even more often. Today, one in five teens has some form of hearing loss - a rate about 30% higher than it was in the 1980s and 1990s - which many experts believe is due, in part, to the increased use of headphones. James E. Foy, DO, an osteopathic pediatrician from Vallejo, Calif., explains what you can do to minimize your child’s risk of hearing loss. "Listening through headphones at a high volume for extended periods of time can result in lifelong hearing loss for children and teens," says Dr. Foy. "Even a mild hearing loss due to excessive noise could lead to developmental delays in speech and language." So, how loud is too loud? "Most MP3 players today can produce sounds up to 120 decibels, equivalent to a sound level at a rock concert. At that level, hearing loss can occur after only about an hour and...