As a parent, it's natural to worry about your child's emotional well-being. If your child is feeling down or upset, it's important to pay attention to their behavior and mood. Sometimes, what you may write off as teenage angst or stress can indeed be a more serious condition, such as depression. In fact, depression is a common mental health issue that can affect children of all ages. Below are five signs you can look out for that may indicate your child is suffering from depression.