How many mg of tylenol (acetaminophen) do you give a child?

Depends on weight: The dosage of tylenol/acetaminophen would depend on the weight of your child in kg. The dosage is usually 15 mg/kg given every 4 hours for pain or fever with 5 doses maximum per day. You can administer either infant or children's tylenol, and the dosage is usually written on the container for children older then 2 years old of various weights. When in doubt, always call your doctor for a dose.