How much screen time is too much for a child? Reports of teens facing high rates of depression, anxiety and loneliness have led to recommendations about their use of social media.

Dr. Nusheen Ameenuddin is a Mayo Clinic pediatrician and a member of the American Academy of Pediatrics. While there are many benefits to technology, she says it also can affect children and teens in negative ways, including some behavioral changes.

Is your teen always texting? Or gaming? Or you just don't know?

"We've always told parents to try to monitor their children's online content, to try to limit it, to make sure that it's not affecting their sleep or their schoolwork or their mood," says Dr. Ameenuddin.

And she says that's a huge job. Kids can get online, literally, from the palms of their hands.

"For parents, I would recommend that they check in with their kid and try to find out what kids are doing when they're online," she says. "Are they spending time playing games with friends? Or are they searching for things? Are they using it for schoolwork?"