Babies always sigh, including physiological as well as pathological factors, such as bad habits, heart disease, lung disease and so on. 1. Physiological factors: baby sighing may be just because in daily life, accidentally developed a bad habit, especially adults often in front of the baby sighing, the baby can imitate learning, and thus gradually formed a habitual behavior. 2. Pathological factors (1) heart disease: if the baby always sighs and accompanied by dyspnea, fatigue and other uncomfortable symptoms, it can be considered that there are some heart diseases caused by, such as common myocarditis and myocardial injury, can affect the heart’s blood and oxygen supply, resulting in insufficient oxygen supply to the heart, so there will be sighing and dyspnea and other uncomfortable symptoms. (2) Lung diseases: such as asthma, a common chronic airway disease, can lead to coughing, wheezing, dyspnea and other symptoms, due to insufficient oxygen intake, can lead to the phenomenon of babies sighing all the time. Due to the causes of the baby’s old sigh more, it is recommended to first go to the hospital to improve the examination for diagnosis.