The baby who is less than three months old is a little hot at night after taking the pneumonia vaccine, most of them are due to the adverse reaction caused by the vaccine, generally no treatment is needed, pay attention to observe the baby’s status. After the pneumonia vaccine, most babies will have some adverse reactions due to the vaccine, and fever is a common side effect, which usually occurs within 24 to 48 hours after the vaccine. No treatment is needed in this case. Parents should keep an eye on their babies and pay attention to temperature changes. During this period, it is recommended to give the baby more warm water, pay attention to rest, you can regularly carry out temperature testing, if the temperature continues to rise or more than 38.5 degrees, you can also use antipyretic drugs under the guidance of the doctor. Pneumonia vaccine to choose the right time, it is recommended to choose the regular hospital, in the injection of the vaccine still have side effects, you can take the baby to the hospital as soon as possible to do the relevant examination.