Difficulty in breathing in 5-year-old babies may be related to allergic reactions, or it may be caused by acute asthma attacks, congenital heart disease and other reasons. 1. Allergic reaction: commonly found in allergic children, after consuming certain foods or medicines, it is likely to cause an allergic reaction, and then it may show dyspnea. 2. Acute asthma attack: the disease is a chronic inflammatory disease of the respiratory tract, if the baby has a history of pediatric asthma, in contact with mold, pollen, animal hair and other substances, is likely to trigger an acute attack of asthma, will cause breathing difficulties, may also be accompanied by chest tightness, shortness of breath and other symptoms. 3. congenital heart disease: the disease is usually caused by abnormal cardiovascular development in the fetal period, is a congenital malformation, can lead to the child’s heart to increase the load, thus causing dyspnea, may also be accompanied by sweating, fast heartbeat and other symptoms. 5-year-old baby dyspnea, may also be caused by other reasons, parents should take their children to the regular hospital in a timely manner, by perfecting the relevant examination, after a clear diagnosis, give targeted treatment.