Infant hand tremor may have physiological, epilepsy, calcium deficiency and other reasons. 1. Physiological: the newborn’s nervous system is still immature, nerve fibers have not yet completed myelination, nerve impulses can be simultaneously affected by the brain to control the muscle nerve fibers of the limbs, hand tremors may occur. 2. Epilepsy: epilepsy is a disease in which neurons in the brain have sudden abnormal discharges, causing temporary brain dysfunction. Epileptic seizures are often manifested as rapid localized or generalized twitching of the body, which may result in trembling of the hands of infants. 3. Calcium deficiency: When infants are deficient in calcium, neuromuscular excitability increases, and hand tremor and other muscle tremors may occur. There may be other causes of hand tremor in infants, so it is recommended to consult a doctor in time, complete the relevant examinations to determine the cause of the disease and then carry out standardized treatment, so as to avoid delaying the condition.