 [ Symptoms ] how much tylenol can i give a 6 year old weighing 45 50 pounds [ Disease ] it is always a good idea to speak with your pharmacist before giving your child an over the counter medication like tylenol the proper dose for a child of that height and weight would be 10 ml or 2 teaspoonfuls of the children is tylenol liquid which would provide 320 mg of acetaminophen if you do not want to use liquid you can give a 6 year old two junior strength tylenol meltaways which would be the same dose