What Temperature Should a Baby's Room Be for Sleep?

You set up the crib, you mastered the swaddle, and then a relative asked, "Is the room too warm for the baby?" Now you are standing in the nursery with a thermometer app, hunting for the one official number that makes it safe. Here is the uncomfortable truth that quietly drives a lot of new-parent anxiety: there is no single magic temperature, and the leading pediatric authority deliberately refuses to give you one. What actually matters is much simpler to get right.

Quick answer

Aim to keep the nursery somewhere in the range of 16-20 degrees Celsius (about 61-68 degrees Fahrenheit) for sleep, and never run heating above roughly 20 C (68 F) overnight. But the temperature dial is only half the job. The American Academy of Pediatrics intentionally does not publish a target room number, because overheating is driven far more by how a baby is dressed than by the thermostat. The reliable rule is to dress your baby in one layer more than you are comfortable wearing in the same room, skip loose blankets entirely, and check the back of the neck or chest to confirm they are warm but not hot. Overheating raises the risk of sudden infant death syndromeSIDSSudden Infant Death Syndrome: unexplained death of an otherwise healthy infant under 1, usually during sleep. The AAP's ABCs of safe sleep (Alone, on Back, in a Crib) cut the risk by more than half. (SIDS), so when in doubt, dress lighter.

Key takeaways

• The 16-20 C / 61-68 F range is a guide, not a hard line. It comes from infant-safety bodies as a comfortable target; comfort and clothing matter more than hitting an exact degree.
• The AAP does not give a thermostat number on purpose. Studies link overheating to higher SIDS risk, but they define "overheating" inconsistently, so the AAP focuses on dressing rather than degrees.
• One layer more than you would wear is the whole rule. Overbundling, not a slightly warm room, is what causes most overheating.
• Feel the chest or back of the neck, not the hands and feet. Babies' hands and feet run cool normally; sweating, flushed skin, or a hot chest mean it is time to remove a layer.

The number parents actually want

If your home naturally sits a degree or two outside that window, do not panic. The range is a comfort target, not a safety cliff. A room at 21 C with a baby in a light sleep sack is fine; a room at 18 C with a baby zipped into fleece, a hat, and a blanket is not.

What most people get wrong: the AAP gives no magic number

This is the part almost no listicle says out loud. People assume the American Academy of Pediatrics publishes an exact safe room temperature, and they hunt for it. It does not. In its safe-sleep guidance the AAP explicitly notes that while studies show overheating raises SIDS risk, those studies define overheating differently, so a precise room-temperature rule cannot be given. Instead the AAP anchors everything to clothing: dress your baby in no more than one layer more than an adult would wear to be comfortable in that room.

So the honest answer to "what temperature should the room be" is: comfortable for a lightly dressed adult, with the baby in one extra layer. The 16-20 C range you see quoted is a useful proxy for "comfortable," popularized by infant-safety organizations, not a hard threshold the AAP enforces. Chasing a single perfect degree is the wrong project. Getting the layers right is the real one.

How to dress your baby for the room

Forget converting your nursery into a lab. Match the layers to the temperature and let one simple rule do the work.

A few non-negotiables that sit underneath all of this:

• No loose blankets, quilts, or comforters in the crib for babies under one. Use a wearable blanket or sleep sack instead, which gives warmth without anything that can cover the face.
• No hats indoors for sleep. Babies release heat through their heads; a hat in a normal room is a fast route to overheating.
• Do not over-dress an unwell baby. When a baby has a cold or fever they may already run warm, so resist the urge to add layers.

How to tell if your baby is too hot or too cold

Your hands are a poor thermometer here, because a baby's hands and feet are usually cooler than their core even when they are perfectly warm. Check the right spots instead.

• Feel the chest or the back of the neck. Warm and dry is the goal.
• Signs of overheating: sweating, damp hair, flushed or red skin, or a chest that feels hot to the touch. Remove a layer.
• Signs of being cold: a genuinely cool chest or back of the neck. Add a layer or a slightly warmer sleep sack, not a blanket.
• Ignore cool hands and feet. On their own they are normal and not a reason to bundle up.

If you find your baby sweaty in the night, strip a layer rather than reaching to crank the thermostat down; the clothing is almost always the faster, safer fix.

A 60-second nursery setup

1. Put a room thermometer where you will actually see it, on the nightstand or wall near the crib.
2. Aim the room toward 16-20 C (61-68 F); if heating runs all night, keep it at or below 20 C.
3. Dress the baby in one layer more than you are comfortable wearing, finished with a well-fitting sleep sack.
4. Strip the crib to a fitted sheet on a firm mattress. No blankets, bumpers, or loose items. Our safe sleep checklist covers the rest of the crib setup.
5. Do a chest-or-neck check whenever you pass by, and adjust a layer up or down as needed.

Bottom line

Stop hunting for the one perfect degree. Keep the room comfortable, lean toward 16-20 C (61-68 F), and put your energy into layers instead of the thermostat: one more than you would wear, no loose bedding, no indoor hat. Then trust a quick touch to the chest or the back of the neck over any number on a screen.

Frequently asked questions

Is 72 F too warm for a baby's room?

It is at the upper edge. The commonly cited comfortable range tops out around 68 F (20 C), and overheating raises SIDS risk, so at 72 F you would want your baby in minimal layers, a single light sleep sack, and no hat or blanket. Lowering the room a couple of degrees is the simpler fix.

Do I really need a room thermometer?

It is genuinely helpful and inexpensive. Rooms feel warmer or cooler than they are, and a thermometer takes the guessing out of it. But it is a guide, not a verdict; the chest-or-neck check on your baby is what confirms they are actually comfortable.

Should the baby wear a hat to sleep?

No, not for routine indoor sleep. Babies lose heat through their heads, so an indoor hat is a common cause of overheating. Hats are for going outside in the cold, not for the crib.

Sources

• How to Keep Your Sleeping Baby Safe: AAP Policy Explained — HealthyChildren.org (AAP)
• Ways to Reduce Baby's Risk — Safe to Sleep (NICHD)
• Your Baby's Room Temperature — The Lullaby Trust