One year old baby pneumonia infusion on the third day and fever is considered may be insensitive to drugs or secondary to other infections, need to choose the treatment according to the specific circumstances, as follows: 1. insensitive to drugs: one-year-old baby pneumonia may be related to bacterial infection, if it is insensitive to the current treatment drugs, it is easy to appear on the third day of infusion and fever. The symptomatic fever treatment at the same time, it is recommended to carry out bacterial culture and drug sensitivity test, replacement of the use of sensitive antibiotic treatment, such as S. aureus infection, you can follow the doctor’s instructions to choose penicillin class of drugs treatment. 2. Secondary infections: It may be due to the baby’s weak body, during the treatment period by other pathogenic infection, such as mycoplasma infection, etc., may also lead to pneumonia is not timely control, resulting in recurrent fever. In addition to symptomatic antipyretic treatment, azithromycin and other macrolides should be used for treatment under the guidance of the doctor. One year old baby pneumonia infusion the third day and fever, there may be other reasons, it is recommended to further examination, clear diagnosis after targeted treatment. The above drugs should be used under the guidance of a doctor.