Loss of consciousness, even briefly
Repeated vomiting
Unusual sleepiness or hard to wake
Excessive crying or irritability
Seizure or shaking
Poor feeding or refusal to eat
Changes in behavior or responsiveness
Trouble staying awake
Unequal pupils
Weakness or not moving an arm or leg normally
Loss of balance or coordination
Bulging soft spot
Blood or clear fluid from the nose or ears
Swelling or a large bump on the head
Not acting normally after a head injury
Any concern after a fall or impact to the head