Baby’s temper tantrums may be a normal phenomenon, or it may be caused by attention deficit hyperactivity disorder, hyperthyroidism and other reasons. 1. Normal phenomenon: baby temper tantrums may be the expression of dissatisfaction, due to the baby’s language is still in the developmental stage, the baby, if the baby does not get along, can not say their own ideas and requirements, will be expressed in the form of tantrums. 2. Attention Deficit Hyperactivity Disorder: Babies with Attention Deficit Hyperactivity Disorder (ADHD) will not only show symptoms of temper tantrums, but also symptoms of inattention, short attention span, and hyperactivity. 3. Hyperthyroidism: Hyperthyroidism can also cause temper tantrums in babies, due to excessive secretion and synthesis of thyroid hormones, resulting in nervous system disorders. At the same time, the baby will also be accompanied by a strong appetite, weight loss, rapid heartbeat and other symptoms. If your baby is irritable and has other symptoms, parents should take your baby to the hospital in time to avoid delays and negative consequences.