Skip to content
SleepBaby .org
Parenting & Family

Taking Your Baby’s Rectal Temperature: A Comprehensive Guide

Read the answer first. The Workshop is here only when you want the next step.

Nurse points to the safety flange on a baby thermometer while a father in a wheelchair holds his infant beside a training doll.

One of the important duties of parenthood is monitoring your baby’s health, and that includes taking their temperature. Rectal thermometers are known to provide the most accurate readings for babies, but they must be used correctly. This guide will help you understand when, how, and why to take your baby’s rectal temperature.

Understanding Rectal Temperatures in Babies

Is Rectal Temp More Accurate for Babies?

Yes, for babies, especially those three months old and younger, a rectal temperature reading is considered the most accurate.

What Rectal Temperature is Considered a Fever in a Baby?

A rectal temperature of 100.4 degrees Fahrenheit (38 degrees Celsius) or higher is considered a fever in a baby.

The household at bedtime

Different people.
One household at night.

If you’re also caring for a baby and want help with sleep, our video is below. Watch when that’s the question you want to work on.

Prefer to read?
Baby Sleep MiracleOriginal presentation
Original Baby Sleep Miracle

Press play for a little help with your baby’s next bedtime.

Kind words about the original video

“Thank you so much for this video!”

Samantha HigginsBaby Sleep Miracle reader · Oakland, FL

“I'm truly impressed with how much information you share in your video.”

Judy LeeBaby Sleep Miracle reader · Fremont, CA

The SleepBaby Workshop

Get the Workshop.

Get the Workshop and explore its resources for everyday baby sleep and nighttime care. 15 guides and five audio tracks in a simple browser hub. Read, listen, and return to the part you need.

Add to Cart

Current price shown in the cart.
Digital Workshop. Nothing ships.

A conversation, if you want one.Night Owls is the SleepBaby chat room. Read what is there or join in.

Open Night Owls

How to Take Your Baby’s Rectal Temperature Safely

How Far Do You Stick a Rectal Thermometer in a Baby?

When taking your baby’s rectal temperature, insert the thermometer about half an inch to an inch (1.25 to 2.5 centimeters) into the rectum.

Should You Use Vaseline on a Baby Rectal Thermometer?

Yes, using a small amount of lubricant like petroleum jelly can make the process more comfortable for your baby.

What Could Happen if You Insert a Rectal Thermometer Too Far?

Inserting a rectal thermometer too far can potentially harm your baby by causing injury to the rectum. Always be gentle and stop if your baby seems uncomfortable.

Understanding Temperature Adjustments

Do Rectal Temperatures Read Higher? Do You Subtract a Degree?

Rectal temperatures can read a little higher due to the internal measurement. You do not subtract a degree for rectal temperatures.

When to Seek Medical Help

When Should You Take Your Baby to the Hospital Based on Their Temperature?

If your baby is less than three months old and has a rectal temperature of 100.4 degrees Fahrenheit or higher, seek medical attention immediately. For older babies and children, call your doctor if the fever is accompanied by symptoms such as lethargy, rash, or trouble breathing.

The Disadvantages and Risks of Rectal Temperature

What Are the Disadvantages of Rectal Temperature?

While rectal temperature readings are accurate, they can be uncomfortable and distressing for the baby. There’s also a small risk of injury if the thermometer is inserted too far.

Tips from Our Readers:

John, Boston, MA:
“I remember my heart pounding when I first attempted to take my son’s rectal temperature. I gently positioned him on the changing table, so his tummy was against the soft, warm pad. The digital rectal thermometer seemed alien, but I had practiced its set up in advance. I dabbed a bit of water-based lubricant on the sensor tip – it wasn’t as tricky as I imagined. The toughest part? Keeping his little legs still. To my surprise, he hardly fussed when the thermometer beeped to indicate it was done. Reading ‘101.5°F’ on the display instantly gave me peace of mind – I knew what to tell the pediatrician.”

Rachel, Sydney, Australia:
“Taking my little Ruby’s rectal temperature was a daunting task at first. The specially designed baby rectal thermometer, with its flexible tip and quick reading feature, was a bit intimidating. I remember cradling Ruby in the football hold, exposing her bottom while ensuring she felt secure. I used petroleum jelly to ease the process, inserting just the very tip of the thermometer. It was surprisingly quick, and Ruby was back to giggling in no time. The relief when the digital readout indicated ‘37.8°C’, just a little elevated, was immense.”

Pascal, Marseille, France:

“First time taking my infant’s rectal temperature, I was worried about causing discomfort. To keep Noé calm, we were in his cozy nursery, his favorite lullaby softly playing. The thermometer, designed for infants, had a stopper to ensure I wouldn’t insert too far. I recall how gently I applied a smidgen of KY jelly, reassuring him softly all along. After a quick minute, the beep echoed in the room and I exhaled in relief seeing ‘38.2°C’ – slightly high, but not alarming. It wasn’t as bad as I had feared.”

How SleepBaby.org Can Help

Taking a baby’s rectal temperature can sometimes be a distressing process that can disrupt their sleep pattern. SleepBaby.org provides expert advice on how to soothe your baby and ensure they get back to sleep quickly and smoothly after the process. The quality of a baby’s sleep can significantly influence their overall health and well-being. Visit SleepBaby.org for helpful resources to improve your baby’s sleep habits and overall health.

Conclusion

While taking a rectal temperature can provide the most accurate readings for babies, it’s essential to do it correctly and understand what the readings mean. It’s also important to know when to seek medical help. Remember, managing your baby’s sleep well is crucial for their health. For help and resources on baby sleep, visit SleepBaby.org.

The SleepBaby.org Workshop

Make a plan for
the next bedtime.

Practical help for wake-ups, short naps, and sharing the night shift. Watch the original video, then get 15 guides and five audio tracks for $9.

$9 USD, paid once. No subscription. Digital access.

Watch the original Baby Sleep Miracle presentation

Baby Sleep MiracleOriginal presentation
Original Baby Sleep Miracle

Press play for a little help with your baby’s next bedtime.

Original presentation. Watch before you decide.

15practical guides

5audio tracks

1one-time payment

Kind words about the original video

“Thank you so much for this video!”

Samantha HigginsBaby Sleep Miracle reader · Oakland, FL

“I'm truly impressed with how much information you share in your video.”

Judy LeeBaby Sleep Miracle reader · Fremont, CA

Inside the Workshop

Start with the night
you're having.

You don't need to read all 15 guides before bedtime. Choose the one that answers the question in front of you, then come back for the next part.

Explore the guides and audio

When you need a starting point

Tonight Rescue

A short order for checking needs, noticing what's happening, and choosing a response when bedtime is close or your baby is awake now.

When a nap changes the day

Nap Rescue & Transition

Work through short naps, refused naps, and changing nap patterns. Decide what to try next without rebuilding the whole day.

When someone else takes a turn

Our Night Handoff

Put feeding guidance, the first response, important contacts, and your bedtime phrase in one clear handoff for the next caregiver.

When the room needs a rethink

Bedroom Reset

Walk through the sleep space, light, sound, and adult movement. Give the setup a careful look before changing your routine.

Help you can put into words

Make the handoff
a little clearer.

The Workshop helps you turn a long explanation into a plan another caregiver can follow. Our Night Handoff covers the details that are easy to forget when you're tired.

See all 15 included guides One collection
  1. Tonight Rescue
  2. The Complete SleepBaby Workshop
  3. Every-Sleep Safe Space Field Guide
  4. 48-Hour Recovery Planner
  5. Bedroom Reset
  6. Our Night Handoff
  7. Sound & Music Lab Setup
  8. Nap Rescue & Transition
  9. Caregiver Shift & Fatigue Plan
  10. 14-Night Progress Review
  11. Daylight Decision Deck
  12. Deep Into Dreams
  13. Sleepy Siblings
  14. Pediatrician Conversation Sheet
  15. Travel & Grandparent Sleep Pack

Sound, when you choose it.

Five audio tracks sit alongside the guides. The included Sound & Music Lab Setup guide covers placement, volume, and finite listening time.

Get all of it for $9 →

Before you buy

A few things
made clear.

A straightforward purchase, with space to decide what fits your family.

What am I buying?

The SleepBaby.org Workshop includes 15 digital guides, five audio tracks, and the original Baby Sleep Workshop PDF as an additional download. It costs $9 USD, paid once, with no subscription. Nothing is shipped.

Where should I start?

Try Tonight Rescue when you need a starting point. If your question is more specific, go straight to the guide on naps, a caregiver handoff, the sleep space, or another topic. You can read at your own pace.

Is this personal sleep coaching?

No. This is an educational collection for parents of babies and young children. Use the age-specific guidance, and bring feeding, breathing, growth, illness, or other health concerns to your child's clinician. It does not diagnose a problem or promise a sleep result.

Is the video the paid Workshop?

You can watch the original Baby Sleep Miracle presentation on this page. Your purchase is the SleepBaby.org Workshop collection of guides, audio tracks, and the original PDF described here.

How do I find it after checkout?

On your thank-you or order-status page, look for Open Workshop access, then Open your SleepBaby Workshop. Keep your order confirmation so you can return. If you need help finding your access, use our Workshop download help.

The SleepBaby.org Workshop

Have somewhere to start
at the next bedtime.

15 practical guides. Five audio tracks. One $9 purchase.

Get the Workshop · $9 USD · one-time payment · no subscription

The guide ends. Your private preview begins.Answer three questions to see a first move and seven-night screening estimate before checkout.

Build my sleep preview

Leave a comment

Reviewed before publishing. SleepBaby.org may remove spam, unsafe instructions, personal data, or promotional links.

Submitting sends only the note you type here. It will not appear until a moderator approves it.