Three-month-old baby jerking back may be a physiological phenomenon, or it may be due to febrile convulsions (due to high fever causing convulsions and seizures), pediatric epilepsy and other diseases. 1. physiological phenomenon: usually three-month-old baby jerking back may just be a manifestation of normal activities, this time the baby’s body is developing, practicing a variety of movements, so, if there is no other abnormalities, is a physiological phenomenon. 2. febrile convulsions: the occurrence of this disease is closely related to fever, mainly because the three-month-old baby’s neurological development is still imperfect, so the possibility of febrile convulsions is relatively large, with infection, genetics, vaccination and other reasons. Typical symptoms include shortness of breath, purplish lips, and tonic spasms of the limbs, which can be manifested as the child jerking back. 3. Pediatric epilepsy: Research has shown that the occurrence of this disease is related to heredity, pathogenic microbial infections, poisoning, brain damage, abnormal brain development and other reasons. Common symptoms include straightening of the eyes and straightening of the limbs, etc. Therefore, the three-month-old child will appear to jerk back. If the three-month-old’s jerking backward is excluded as a physiological phenomenon, it is necessary to go to the hospital in time to consult the doctor to clarify the specific causes.