The vast majority of infantile pneumonia does not have sequelae, and there is no trace of it in the lungs after recovery. However, there are still some cases of pneumonia that have sequelae, including chronic pneumonia, occlusive bronchitis, pulmonary fibrosis, and even cerebral palsy due to prolonged oxygen deprivation and prolonged exposure to ventilator, resulting in retrogression of intellectual level and motor ability. The causes of sequelae include: First, the type, quantity and virulence of the infected pathogen, such as adenovirus types 3 and 7 can lead to very serious pneumonia, resulting in sequelae, measles pneumonia can easily lead to occlusive bronchiolitis. Second, the children’s ability to resist disease is also one of the factors of complications, if the nutritional status is poor, usually partial food, picky eating, weight does not meet the standard, anemia, there are other underlying diseases, easy to develop severe pneumonia, and leave sequelae. Third, the treatment, the treatment starts too late, not standardized is also a factor that leads to the seriousness of the disease, and ultimately leave sequelae.