The manifestations and symptoms of ADHD in babies mainly include attention deficit and hyperactivity. 1. Attention deficit: that is, inattention, is the most important symptom of the disease. For example, the baby can sit and listen to the lecture in the classroom, but the attention can only be focused for a short period of time, and is easily distracted, unable to catch the key contents of the teacher’s lecture; or when playing with toys, he/she shows inattentiveness. 2. hyperactivity: that is, too much activity, such as the baby in the seat often move around, can not sit quietly, constantly doing small movements, will not distinguish the occasion of the clamor. As age increases, the symptoms of hyperactivity will decrease, showing impatience and restlessness. There may be other manifestations and symptoms of ADHD in babies, and once detected, they need to go to the hospital immediately for early intervention and timely treatment.