How dow you tell whan a 3 year old hase the flue?

See below. Influenza (the 'real flu') symptoms include high fever, severe cough, aching all over, bad headache, and fatigue. If you think your child may have the flu, please call your child's doctor and be seen.
Viral infection. Flu is a viral infection. Child will have fever, colds , cough, body aches , poor appetite lasting for a week. Complications with bacteria can occur so your child should be seen by your doctor.