Pneumonia in three-month-old babies may have different degrees of sequelae if other organs are involved. Pneumonia in babies can be cured, but it is easy to involve other organs, and when it involves other organs such as the brain and the heart, there may be different degrees of sequelae. For example, if combined with encephalitis, there may be neurological sequelae; involved in the heart, causing the heart’s pumping function to decline, resulting in a decrease in the contraction ability of the heart muscle cells or even lead to heart failure. When you suspect that your baby is suffering from pneumonia, you should go to a regular hospital in time and under the guidance of the doctor, so as not to delay the condition and lead to aggravation of the condition, involving other organs, and then the phenomenon of sequelae.