ADHD Symptoms In Children:It’s normal for children to occasionally forget their homework, daydream during class, act without thinking, or get fidgety at the dinner table. But inattention, impulsivity, and hyperactivity are also signs of attention deficit hyperactivity disorder (ADHD), sometimes known as attention deficit disorder or ADD.ADHD is a common neurodevelopmental disorder that typically appears in early childhood, usually before the age of seven. ADHD makes it difficult for children to inhibit their spontaneous responses—responses that can involve everything from movement to speech to attentiveness. We all know kids who can’t sit still, who never seem to listen, who don’t follow instructions no matter how clearly you present them, or who blurt out inappropriate comments at inappropriate times. Sometimes these children are labeled as troublemakers, or criticized for being lazy and undisciplined. However, they may have ADHD.