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This is Dr. David
you should look for lethargy, not wanting to play or eat, excessive sleepiness
best to bring him to the ER and have him evaluated by a doctor
if he is dehydrated, they can give him IV fluids at the ER
you don't want to miss a rare subdural bleed in the brain from head trauma.
do you have an ER or hospital close to you where you can bring him for evaluation?