When a child has a fever, it is important to measure their temperature accurately. While taking a temperature under the armpit is quick and easy, it is not as precise as taking a rectal temperature. If your child has a fever, giving them acetaminophen (such as Tylenol) based on their weight can help bring down the fever. It is important to keep your child hydrated by encouraging them to drink fluids. Fevers in children are a normal part of their immune system development, but if the fever persists for 72 hours or if your child is unable to eat or drink, it is best to consult a doctor. Remember to follow the dosage instructions for any medication and seek medical advice if needed.