With stories in the news about nightmare nannies harming children, it’s important to learn the warning signs of a bad nanny. Parents may feel unsafe leaving their child at home with a caregiver they don’t know well, and sometimes even the most trusted nannies can harm kids. There are ways to determine if your nanny is misbehaving while you’re away. Here are 5 warning signs of a bad nanny, and what you can do to keep your children safe.