Vomiting after a baby falls on his head may be related to factors such as being frightened, concussion and intracranial hemorrhage. 1. Suffering from shock: If the baby cries a lot after falling on his head and starts to vomit after crying for a long time, but there are no other abnormal manifestations or abnormal sensations, it may be caused by the baby’s shock at the time of the fall, coupled with persistent crying, which leads to sympathetic excitation and stimulates gastrointestinal spasms. 2. Concussion: If the baby falls on his head and causes mild brain injury, i.e. concussion, it can cause dysfunction of autonomic nerves and brain stem, thus causing dizziness, vomiting, memory loss and other symptoms. 3. Intracranial hemorrhage: when the blood vessels in the baby’s skull rupture and bleed due to the fall, the blood gathers in the brain parenchyma, which will cause an increase in intracranial pressure, and the baby may experience nausea and vomiting, severe headache, and optic papillae edema triad. After the baby fell head, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.