Three-year-old baby tantrum shouting, mainly due to improper parental discipline, pediatric ADHD, rickets and other reasons. 1. Improper parental control: mainly due to spoiling, bad living environment, incorrect education and other causes of the child’s temper tantrums and shouting personality. 2. Pediatric Hyperactivity Disorder: also known as Attention Deficit Hyperactivity Disorder (ADHD), is a common neurodevelopmental disorder in childhood. It can lead to emotional instability and easy to be over-excited, which can lead to temper tantrums and shouting. 3. Rickets: It is a chronic disease mainly characterized by bone lesions caused by abnormal calcium and phosphorus metabolism and osteogenesis disorder due to various factors. Early children can appear excessive sweating, occipital baldness, irritability and other symptoms, which can lead to tantrums and shouting phenomenon. It is recommended that when a three-year-old baby has tantrums and shouting, he should go to the hospital in time and follow the doctor’s instructions, so as to avoid delaying his condition.