Best Baby Thermometers (2026): Rectal, Forehead, and Ear, and Which to Use When

Every family needs a thermometer before the first fever, not during it. The right type depends on your child's age, and the American Academy of Pediatrics is clear about which methods work when. This guide sets out the AAP's method-by-age guidance, then compares eight thermometers sold by trusted sellers.

Key point: this is a buying guide, not medical advice. The fever guidance below is quoted from the AAP's HealthyChildren guide to taking a child's temperature (last updated April 2024). If your child is unwell, call your pediatrician.

Which Type of Thermometer to Use at Which Age

The AAP's guidance, quoted from the page above:

The AAP also says: "Do NOT use a mercury thermometer." Every thermometer in this guide is digital or infrared.

Bottom line: for a newborn, buy a digital rectal thermometer first. A forehead or ear thermometer is a convenient second one, and the ear type is only for babies 6 months and older.

How Do the Thermometers Compare?

List prices were checked in September 2026. Speed and accuracy figures are the brands' claims; we have not tested these thermometers.

What Temperature Is a Fever?

The AAP defines it this way: "A fever usually is a temperature of 100.4 degrees Fahrenheit (38 degrees Celsius) or higher."

It also says when to call. Quoting the AAP: "Call your pediatrician right away if your child: is 2 months old or younger with a rectal temperature of 100.4 degrees Fahrenheit or higher, or if fever rises above 104°F (40°C) repeatedly at any age."

Key point: that is why the rectal reading matters so much for a young baby. A single rectal reading of 100.4°F or higher in a baby 2 months or younger is a reason to call right away, so the reading needs to come from the most accurate method.

Several thermometers here have color-coded screens: green for normal, yellow or red for higher readings. Each brand sets its own color thresholds. Use the number on the screen, not the color, when you talk to your pediatrician.

Best Rectal Thermometers for Newborns

A rectal thermometer is the one the AAP describes as giving "the best reading, especially for infants under 3 months of age." Four picks here can take a rectal temperature:

• Safety 1st 5 Second Read ($12.79) is the cheapest and the fastest stick here, per its listing. Its listing cites the AAP's advice on rectal temperatures for young children.
• Frida Baby Digital Rectal ($16.99) is made only for rectal use, with a flexible tip, a 10-reading memory and a case.
• Vicks SpeedRead ($16.99) works orally, rectally or under the arm, with a color-coded display.
• Kinsa QuickCare ($29.50) adds an app that logs readings and symptoms for each family member. It is sold by Kinsa Health rather than Amazon.com.

Pro tip: if you buy a multi-use stick such as the Vicks or Kinsa, keep one for rectal use only and label it. Buy a second one for oral or underarm use as your child grows.

Best Forehead and Ear Thermometers

These read in a second or two and are easier with a squirming or sleeping child.

• Braun No Touch 3-in-1 ($35.52): reads the forehead without touching it. Braun states ±0.4°F accuracy and a silent mode for a sleeping child.
• Frida Baby 3-in-1 Infrared ($39.99): combines ear, forehead and touchless modes, with a 40-reading memory.
• iProven Ear and Forehead ($27.99): switches between forehead mode (cap on) and ear mode (cap off). It is sold by iProven.
• Braun ThermoScan 7 ($74.99): an ear thermometer with a pre-warmed tip, a positioning light and beep, and disposable lens filters.

Best for: a forehead thermometer is the one the AAP says works at every age, so it is the most useful second thermometer for a new baby. An ear thermometer becomes an option at 6 months.

Braun says the ThermoScan 7 is "clinically proven as accurate as a rectal thermometer for babies". That is the brand's claim. The AAP's guidance is that ear thermometers are "Not reliable for younger babies" and are for children 6 months and older, so follow the AAP for a baby under 6 months.

What Else to Look For

• Memory. When you call the pediatrician, a list of readings and times helps. The Frida 3-in-1 stores 40 and the iProven 20. The Frida rectal and Braun No Touch store 10.
• A silent mode. The Braun No Touch can switch off its beep, so you can check a sleeping child without waking them.
• Easy cleaning. The Frida rectal and Vicks SpeedRead are listed as water-resistant. The ThermoScan 7 uses disposable lens filters.
• The seller. Every thermometer here is sold by Amazon.com, except the iProven (sold by iProven) and the Kinsa (sold by Kinsa Health). We left out a popular temporal-artery brand because we found it only from resellers.

A thermometer belongs on the first-aid list with the other essentials. See our baby registry checklist on a budget for the rest, and our babyproofing checklist by age for the home. Before buying any health product secondhand, check our baby product recalls page.

Frequently Asked Questions

What is the most accurate thermometer for a baby?

A digital rectal thermometer. The AAP says "Rectal (in the anus) temperatures are the most accurate," and that a rectal reading is best "especially for infants under 3 months of age."

Can I use a forehead thermometer on a newborn?

The AAP says forehead thermometers "Can be used for all ages." For a baby under 3 months, though, it says a rectal reading gives the best result. You can keep both: a forehead thermometer for a quick check and a rectal one for the most accurate reading.

When can I use an ear thermometer on my baby?

From 6 months. The AAP says ear thermometers "Can be used on children age 6 months and older. Not reliable for younger babies, whose ear canals are too narrow."

What temperature is a fever in a baby?

Per the AAP, "A fever usually is a temperature of 100.4 degrees Fahrenheit (38 degrees Celsius) or higher." Call your pediatrician right away if a baby 2 months or younger has a rectal temperature of 100.4°F or higher, or if fever rises above 104°F (40°C) repeatedly at any age.

Are pacifier thermometers accurate?

The AAP says pacifier and strip thermometers "do not work as well as measuring your child's rectal, forehead, ear or oral temperature." Use a digital rectal, forehead or ear thermometer instead, depending on your child's age.

This guide is for general information and is not medical advice. If you are worried about your child's temperature or health, contact your pediatrician.