My 18 month baby fell from a kitchen chair. she cried about 2 or minutes and stop. but later on the day like 4 hrs later she vomite what she ate.

About head bonks...: Children often hit their heads on things. If a child is behaving differently after a mild injury, she should be evaluated by her primary doctor. Sometimes an emergency room visit is needed, depending on the symptoms. Head bumps in which there is low-impact on the head, little crying, no changes in behavior and no headache after the first hour, etc..., usually don't cause internal injuries.