The slow heart rate of preterm babies is usually related to physiological factors, metabolic abnormalities and congenital heart disease, and requires general treatment, medication or surgery depending on the cause. 1. Physiological factors: Preterm babies may be physically weak and immature in every function of the body, so it is easy for them to have a slow heart rate before the body has fully recovered. Generally, as the baby grows older, the slow heart rate will be relieved on its own and no special treatment is needed. 2. Metabolic disorders: The metabolism of preterm infants may be in a state of disorganization, and if not regulated in time, it will lead to a slow heart rate. Preterm babies should be allowed to rest reasonably, have enough sleep, and insist on breastfeeding to ensure adequate nutrition. 3. Congenital heart disease: for example, congenital bradycardia, sinus node syndrome, etc., may lead to heart rate slowing. In mild cases, no special treatment can be done. In serious cases, atropine and salbutamol can be taken orally as prescribed by the doctor. If the symptoms do not improve in adulthood, a pacemaker is required. If the heart rate of premature babies is slow, it is recommended to go to the hospital for examination first, and give targeted treatment according to different situations, and not blindly use medication on their own.