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1 Call the doctor if your child is an infant; has lost consciousness, even briefly; or if a child of any age has any of these symptoms: 2  won't stop crying. 3  complains of head and neck pain (younger or nonverbal children may be more fussy)  vomits several times.
Children under 4 are the most frequent victims of head injuries, and young athletes get mild-to-serious concussions on a regular basis. It's not known how likely it is that a child who hits her head will have a concussion, partly because there's no agreement among experts on the definition of the term in children.