If your baby has a fever, focus on staying calm, keeping them comfortable and hydrated, and knowing when to seek urgent medical care.

First: Check age and temperature

Fever is usually considered a temperature of 100.4°F (38°C) or higher.

  • Newborn to under 3 months
    • Any temp of 100.4°F (38°C) or higher: this is an emergency → contact a doctor or go to emergency/urgent care immediately.
* Do not give fever medicine at home unless a doctor specifically tells you to, because it can hide important signs.
  • 3 to 6 months
    • 100.4–101.9°F (38–38.8°C): call your doctor if you’re worried, especially if baby seems unwell (poor feeding, very sleepy, hard to wake, trouble breathing).
* 102–103.9°F (38.9–39.9°C): call your doctor or nurse line for advice; they may suggest medicine and may want to see the baby.

* 104°F (40°C) or higher: go to urgent care or emergency right away.
  • 6 to 24 months
    • Mild–moderate fever and otherwise acting fairly normal: often can be managed at home with fluids, comfort and close monitoring.
* Very high fever (around 104°F / 40°C or more), or fever lasting more than about 2–3 days, or any worrying symptoms → call doctor or go in.

What you can safely do at home

When the doctor has not told you to go straight to ER, focus on comfort and hydration.

Keep baby hydrated

  • Offer plenty of fluids :
    • Breast milk or formula more often than usual.
* Watch for signs of dehydration: fewer wet diapers, very dry mouth, no tears when crying, very sleepy or floppy.
  • If your older baby already takes some solids, you can offer water-rich foods (fruit purees, etc.) only if your pediatrician says this is appropriate.

Make them comfortable (non‑medicine measures)

  • Dress baby in lightweight, breathable clothing ; avoid heavy blankets or lots of layers that trap heat.
  • Keep the room comfortably cool , not cold; you can use a fan to circulate air but don’t aim it directly at baby.
  • Offer extra cuddles and rest ; let them sleep if they’re sleeping comfortably (you don’t usually need to wake them just to give fever medicine unless your doctor advised it).
  • A lukewarm bath or sponge bath can sometimes help baby feel better:
    • Water should feel slightly warm on your wrist, not hot and not cold.
* Avoid cold baths and alcohol rubs, which can cause shivering and may raise internal temperature.

Using fever medicines (only when appropriate)

Always check with your pediatrician and follow age/weight dosing carefully.

  • Acetaminophen (paracetamol, e.g., Tylenol)
    • Can be used in babies over about 3 months if they are uncomfortable, using the correct dose for their weight.
* Check the package and use the measuring device that comes with the medicine; when in doubt, call your doctor or pharmacist.
  • Ibuprofen (e.g., Motrin, Advil)
    • Generally for babies 6 months and older, again with careful dosing based on weight.
* Do not give both medicines together unless your doctor tells you exactly how and when.
  • Do NOT
    • Do not give any fever medicines to babies under 2–3 months unless a doctor has specifically told you to.
* Do not give aspirin to a child because of the risk of serious side effects.

The main goal of medicine is to make baby more comfortable , not to “chase” the number on the thermometer. A baby with a mild fever who is drinking, playing a bit and responsive may not need medicine at all.

When to call a doctor or go to ER immediately

You should get urgent medical help (call your pediatrician, urgent care, or ER) if your baby:

  • Is under 3 months old and has a temperature of 100.4°F (38°C) or higher.
  • Seems very lethargic, difficult to wake, or unusually floppy.
  • Has trouble breathing, breathing very fast, drawing in the skin around ribs, or grunting.
  • Has blue, gray, or very pale skin or lips.
  • Cries nonstop or is inconsolable, or cries when touched or moved.
  • Has signs of dehydration (no wet diaper for 6–8 hours, very dry mouth, no tears).
  • Has a seizure (even a brief one).
  • Has a new rash, especially one that spreads or looks like purple/red dots or bruises.
  • Keeps vomiting or cannot keep fluids down.
  • Is unvaccinated and has a fever.
  • Has a fever that lasts more than about 2–3 days, or you are simply very worried.

In all of these situations, do not wait at home hoping it will pass; get help right away.

Quick “what to do when baby has a fever” checklist

  • Take baby’s temperature with a reliable thermometer, write down the number and how you took it (rectal, underarm, etc.).
  • Check baby’s age :
    • Under 3 months + 100.4°F or higher → emergency care.
  • If older:
    • Keep baby hydrated (breast milk, formula, extra fluids).
* Dress in light clothing, keep room comfortably cool.

* Consider age‑appropriate acetaminophen or ibuprofen if they’re uncomfortable, after confirming dosing.

* Watch for any danger signs (breathing trouble, extreme sleepiness, poor feeding, rash, very high fever, seizure).
  • Call your pediatrician anytime you’re unsure or worried; they’d rather you ask than sit at home anxious.

Mini story example (to make this concrete)

A parent notices their 8‑month‑old feels hot and is fussier than normal, with a rectal temp of 102.2°F. They offer more breast milk, dress the baby in a light onesie, cool the room slightly, and give a pediatrician‑approved dose of acetaminophen because the baby looks uncomfortable. Over the evening, baby drinks, has wet diapers and settles to sleep, but the parent checks on them regularly and calls the doctor the next morning when the fever is still present and a cough appears, following standard guidance.

Important note

Online information is helpful for general guidance, but it never replaces advice from your child’s own doctor who knows their history and can examine them in person. If your instinct says “something is wrong,” seek medical care, even if the numbers don’t look dramatic.

Information gathered from public forums or data available on the internet and portrayed here.