Vomiting after a baby falls out of bed may be caused by concussion, intracranial hemorrhage, emotional distress, etc., and requires further differential diagnosis by a doctor. 1. Concussion: A baby falling out of bed can have a concussion, which can lead to autonomic dysfunction, headache, dizziness, nausea, vomiting and other symptoms. 2. Intracranial hemorrhage: If a baby falls out of bed and causes intracranial hemorrhage, the intracranial pressure will increase and symptoms such as vomiting may occur. 3. Emotional excitement: babies may cry after falling out of bed and other emotional situations, causing sympathetic hyperactivity, vomiting can occur. Parents are advised to take their babies to the hospital in time to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor to avoid delaying the condition.