Apr 19, 2026 · Jesse Jones, MSN, APRN, CPNP-PC · — min read

Fevers: the 3 things every parent should know from a pediatric nurse practitioner

After nine years in pediatrics — five of them in pediatric ICUs — these are the three things I repeat most to worried parents.

Fever is probably the number-one reason parents reach out to me after hours. And I get it. You put your hand on your kid’s forehead, you feel heat, you grab the thermometer, and the number that comes up looks scary — 102, 103, sometimes higher. Your brain immediately jumps to “how high is too high?” and “what does a fever this high mean?”

Almost every time, the answer is: less than you think.

Here are the three things I find myself telling parents over and over — the things I wish every parent knew before they ended up in an ER waiting room at 11 PM with a kid who was going to be fine all along.

1. Fever is the body doing its job. You don’t have to “break” it.

A fever is not the illness. A fever is your child’s immune system working. When a virus or bacteria gets in, the immune system turns up the thermostat on purpose — higher body temperatures make it harder for the invader to survive and replicate, and they ramp up the production of the white blood cells that clear the infection.

Your kid isn’t broken when they have a fever. Their body is fighting. That’s what it’s supposed to do.

Which means your goal, as the parent, is not to get the number down. Your goal is to keep your child comfortable while their body does the work. Sometimes that means medication. Often it doesn’t. A kid with a temp of 102 who’s sipping water, playing a little, watching a show, and generally acting like themselves doesn’t need anything except rest and fluids. A kid with the same temp who’s miserable, achy, and crying — that kid probably benefits from medicine, not because the number is high, but because they feel bad.

Treat the kid, not the thermometer. If your child is drinking, interactive, and tolerable, you don’t need to medicate just because the number ticked up.

2. The fear that high fevers cause seizures or brain damage is mostly wrong.

This is the belief that drives so much of what I see at 10 PM: the idea that if we don’t bring the fever down right now, something bad is going to happen. That untreated fever will climb to dangerous levels and cause a seizure or fry the brain.

It’s not really how any of this works.

Fevers from infections — the kind your kid gets — almost never climb above about 106°F. The brain has a built-in thermostat that keeps body temperature in a safe range. A fever of 104 sounds terrifying because the number is big, but it is not the same kind of problem as a 104-degree body temperature from heatstroke (which is dangerous — that’s the thermostat failing, not working).

As for seizures: febrile seizures are real, and they are genuinely one of the scariest things a parent can witness. Your child’s eyes roll back, their body stiffens and jerks, they stop responding for a minute or two. It is awful. But here are two things parents almost never get told:

• Febrile seizures don’t cause brain damage. Research has shown repeatedly that simple febrile seizures — even ones that look horrifying — don’t affect long-term development, IQ, or neurological outcomes.
• You can’t prevent them by treating the fever aggressively. They’re triggered by how fast the temperature rises, not by how high it gets. Pumping Tylenol and Motrin into a kid to “keep the fever down” does not reduce the risk of a febrile seizure happening. Studies have tested this directly.

I’m not saying febrile seizures don’t matter. A first-time seizure always gets a call to your clinician or, if it lasts more than about 5 minutes, a trip to the ER. But the mental model of “the fever itself is dangerous and must be stopped” — that’s the part that leads parents to over-medicate, wake sleeping kids up to dose them, and lose their own sleep over a thermometer reading. None of it is necessary.

3. If you do medicate for comfort: pick one, dose it right, and save the other for breakthrough.

Once you’ve decided your kid is miserable enough to benefit from medication, the question is: which one, and how much?

Two options are appropriate for kids:

• Ibuprofen (Motrin, Advil) — for children 6 months and older. This is what I usually reach for first. It tends to bring the temperature down further and last longer (6–8 hours per dose vs. 4–6 for acetaminophen), and in my experience kids often seem a bit more comfortable on it.
• Acetaminophen (Tylenol) — appropriate from infancy. This is the right choice for babies under 6 months, for kids who can’t tolerate ibuprofen, or when ibuprofen isn’t working well enough and you need a breakthrough dose.

Here’s the key: you don’t need to alternate them routinely. The old advice of “alternate Tylenol and Motrin every three hours” is mostly unnecessary for most kids, and it’s a great way to accidentally overdose — or, more commonly, to lose track of what you gave when and end up either under-dosing (so the fever “won’t come down”) or over-dosing (which is its own kind of bad).

A cleaner approach: pick one as your primary, dose it correctly by weight, and keep the other one as a breakthrough option if your primary isn’t giving enough relief before the next dose is due. That way you’re not stacking medications unnecessarily, and when you do need to give the other one, it still works.

And the single most important part of dosing either medication: dose by weight, not by age. The little chart on the bottle that goes “ages 2–3 = this dose” is a shortcut, and it’s wrong for roughly half the kids I see — because a small 3-year-old and a big 3-year-old need different doses. Weight-based dosing is how we do it in clinical settings, and it’s what I recommend parents do at home too.

When a fever does warrant a call

None of this means fevers are never a concern. They are in specific situations. Call or go to the ER for:

• Any fever in a baby under 3 months old (100.4°F / 38.0°C or higher). This one’s different from everything I said above. In a newborn, fever is an ER-level concern until proven otherwise. No “treat the kid, not the number.” Just go.
• A fever that persists longer than about 5 days, even if your child otherwise seems okay. At that point we want to take a look and make sure it’s not something more than a routine virus.
• A fever that breaks and then returns after 24–48 hours of being normal. Same reasoning.
• A fever accompanied by red-flag symptoms: trouble breathing, unresponsiveness, a stiff neck, a rash that doesn’t blanch when pressed, severe dehydration, persistent vomiting, or a first-ever seizure.
• Any fever in a child with a weakened immune system — on chemo, on immunosuppressants, with sickle cell, etc. Different rules apply. Call your specialty team.

If none of those are in the picture, the odds are overwhelming that what you’re seeing is a healthy immune system doing exactly what it’s built to do.

One last thing

The next time you’re standing in your kitchen at 11 PM holding a thermometer and trying to decide whether to panic: take a breath. Look at your kid. Are they drinking? Are they responding to you? Can they sleep? Will they smile, even tiredly?

If the answer is yes — even a reluctant, sick-kid yes — the number on the thermometer matters much less than you think. Your job is to be the calm adult in the room while their body does the work. That’s it.

And if you want the math on dosing done for you, the calculator above will do it.

Stay steady out there.

— Jesse