Fever in children is one of the most common reasons parents call their pediatrician — and one of the most misunderstood. Your child wakes up hot, flushed, and miserable. You grab the thermometer and — yep, fever. Now what?

For most parents, a fever triggers an immediate sense of alarm. But here’s something worth knowing: fever is not the enemy. It is your child’s immune system doing exactly what it is supposed to do — fighting off an infection. The temperature itself is rarely the problem. The real question is what is causing it, and whether your child needs to be seen.

This guide walks you through what the numbers actually mean, when you can manage things at home, and when it is time to call us.

 

What counts as a fever?

A fever is a temperature of 100.4°F (38°C) or higher. A temperature just above normal — say, 99°F — is usually not a fever; it can come from a warm room, bundled clothing, or activity.

How you take the temperature matters, especially in younger children:

• Rectal — most accurate for infants under 3 months
• Temporal artery (forehead scanner) — reliable and quick for most ages
• Oral — accurate for children over 4 who can hold the thermometer under the tongue
• Ear (tympanic) — convenient, but less reliable in very young infants
• Armpit (axillary) — least accurate; if it reads 100°F or above, confirm with another method

 

Age matters more than the number

The height of the fever is less important than how old your child is. A 104°F fever in a healthy 5-year-old with a cold is usually far less concerning than a 101°F fever in a 6-week-old.

Under 3 months — call us or go to the ER immediately

Any fever of 100.4°F or higher in a baby under 3 months old is a medical emergency. Newborns and young infants have immune systems that have not had time to develop. They can get very sick, very fast, from infections that an older child would shake off. Do not wait, do not give Tylenol and see if it comes down. Get seen right away.

3–6 months

A fever in this age group still needs same-day medical attention. Call us. Your provider will want to evaluate your baby, ask about other symptoms, and decide if any testing is needed.

6 months to 2 years

This is the age range where febrile seizures occasionally occur — brief, usually harmless seizures triggered by a rapid rise in temperature. If your child has a febrile seizure, stay calm, do not put anything in their mouth, and call 911 if it lasts more than 5 minutes or if your child does not return to normal within 30 minutes. After a first-time febrile seizure, your child should be evaluated.

For fevers without a seizure, the key things to watch are how your child looks and acts: Are they alert? Can they be comforted? Are they drinking fluids? If the answer is yes, home management may be appropriate. If the answer is no — or if the fever has lasted more than 2 days — give us a call.

2 years and older

At this age, children can generally tell you what hurts. A fever with a sore throat, runny nose, or cough is usually a sign of a viral illness, and most of those resolve on their own within 5–7 days.

Watch for:

• Fever lasting more than 3 days
• Fever that goes away for 24 hours and then comes back
• Ear pain, significant throat pain, or difficulty swallowing
• Rash that appears alongside the fever
• Your child refusing to drink anything for several hours

Any of those — give us a call.

 

How to make a feverish child more comfortable

You do not have to treat a fever. But if your child is uncomfortable, there are a few things that help:

Acetaminophen (Tylenol) or ibuprofen — these are safe and effective for reducing fever and easing discomfort. A few important notes:

• Ibuprofen is only for children 6 months and older
• Do not give aspirin to children — it is associated with a serious condition called Reye’s syndrome
• Always dose by weight, not age. The packaging shows dosing charts, and we are happy to help if you are not sure
• Do not alternate between the two medications unless your provider recommends it

Fluids — fever increases fluid loss. Breast milk, formula, water, diluted juice, or Pedialyte all work. Popsicles count. Getting fluids in is more important than getting the fever down.

Light clothing — bundling a feverish child makes them feel worse, not better. Dress them lightly and keep the room comfortable.

Rest — there is no shortcut here. Sleep is how children recover.

 

When to call A+ Kids Pediatrics