---
title: "Baby's Room: Temperature, Fans and Safe Sleep"
description: "What is the right temperature for a baby's room? Fans, air conditioning, humidifiers, light, white noise, tummy sleeping and raised cribs: what the sources say."
canonical: https://buppi.baby/en/blog/baby-room-temperature-fan-safe-sleep/
last-updated: 2026-11-05
---

# Baby's Room: Temperature, Fans and Safe Sleep

> What is the right temperature for a baby's room? Fans, air conditioning, humidifiers, light, white noise, tummy sleeping and raised cribs: what the sources say.
>
> Canonical: https://buppi.baby/en/blog/baby-room-temperature-fan-safe-sleep/

What protects a baby most in the room is simple: sleeping on the back, in a firm, flat, empty crib, without too much heat. Temperature, fans, humidifiers and white noise come after that, and the sources are less firm about them. The table sums up each question, and the sections below explain what supports each answer.

| Question | Short answer | Strength of the advice |
|---|---|---|
| Position | Always on the back, until age 1 | Firm recommendation from the American Academy of Pediatrics (AAP) |
| Crib | Firm, flat, no loose objects | Firm AAP recommendation |
| Inclining the crib | No, not even with reflux | Firm AAP recommendation |
| Clothing and heat | At most one layer more than you | AAP advice |
| Temperature | Keep it cool as best you can | A number only from the UK, not adapted to hot climates |
| Fan | Prefer cooling the room beforehand. If used, don't aim it at the baby | Sources disagree |
| Air conditioning | Fine, with no direct airflow | No specific study, practical tip |
| Light | Dark room and low light at night | General advice, no number |
| White noise | Low and far from the crib | Lab study, with no hearing outcome |
| Humidifier | Cool mist only, out of reach and clean | AAP and US environmental agency advice |

## Position: always on the back

The AAP advises placing babies on their back for every sleep, including naps, until age 1. It states that the side position is just as dangerous as the stomach.

Once a baby learns to roll, the question changes. If they already roll easily both ways, the AAP says you don't need to keep turning them back. Keep placing them on their back and keep the crib empty, because they may roll into whatever is there. Stop swaddling when your baby shows signs of trying to roll.

Awake tummy time is a different matter. Awake and supervised, time on the tummy is part of development.

## The crib: firm, flat and empty

The surface should not dent under the baby, and the AAP considers any incline above 10 degrees unsafe. That applies to reflux: babies with reflux should also sleep flat on their backs. It also applies to a stuffy nose: the AAP warns that propping a baby on towels or pillows, or inclining the mattress, may seem harmless but isn't safe.

Pillows, bumpers, blankets, toys and loose clothing should stay out of the crib, because of the risk of suffocation and entrapment. The AAP also advises against weighted blankets, sleepers and sleep sacks. For more detail, see [how to transfer to the crib without waking your baby](/en/blog/baby-only-sleeps-when-held/).

Until at least 6 months, the AAP recommends sleeping in the same room as the parents, in the baby's own crib. For sleeping in the same bed, read our article on [bed sharing](/en/blog/bed-sharing-with-baby-risks-guidelines/). Home heart rate monitors are not recommended as a way to reduce the risk of sudden infant death.

## Temperature and clothing in the heat

The NHS, the UK's health service, considers 16 to 20 °C a comfortable and safe temperature for a baby's sleep. The AAP gives no number. We found no reference with a range adapted to hot climates, and in many places those temperatures are far from reality without air conditioning.

Heat itself deserves attention. A 2022 review points out that overheating comes mainly from too much clothing and bedding for the room temperature, and also cites sleeping on the stomach, bed sharing and head covering. So even without reaching 20 °C, you can reduce the risk a lot:

- **Dress your baby in at most one layer more than you.** On very hot nights, a leaflet from a British health service says just a diaper, or a diaper and vest, with no bedding, is acceptable.
- **Check the chest or tummy.** Cold hands and feet are normal. The AAP lists sweating, a hot chest and flushed skin as signs of too much heat.
- **No hat indoors.** Both the AAP and the NHS advise removing hats indoors.
- **Cool the room during the day.** Closing curtains during sunny hours and opening windows when it cools down helps. A room thermometer also helps you see what is happening.
- **Respond if your baby asks for the breast more.** On very hot days, it is normal for a breastfed baby to want to feed more often.

## Fans and air conditioning

**Fans.** The most cited data come from a 2008 American study, with 185 babies who died of sudden infant death and 312 comparison babies. Using a fan during sleep was linked to 72% lower risk, especially in warmer rooms. It is a case-control study, based on interviews with mothers. It doesn't prove that fans protect, and it doesn't replace the other measures.

Guidance varies. The AAP doesn't cover this on its family page, and the British leaflet cited above advises not leaving the device in the room during sleep. So the simplest option is to cool the room before your baby sleeps. If the family decides to keep a fan on, talk to your pediatrician and take these precautions:

- Don't aim the airflow at your baby, so that it circulates around the room.
- Keep the device and cord away from the crib and out of reach, on a stable base.
- Clean the blades, and check by the tummy or chest that your baby isn't cold.

**Air conditioning.** We found no study specifically on its use with babies. As a practical tip, avoid direct airflow on the crib, keep the filter clean and dress your baby for the actual room temperature, without adding loose blankets.

## Light and noise

**Light.** The NHS suggests keeping lights low during night feeds and changes, to help babies tell day from night. We found no number or light color with strong evidence for babies. A dark room for sleep and a dim light only when needed are a good starting point.

**White noise.** A study tested 14 devices at maximum volume and, at 30 cm away, all went above 50 decibels, the limit recommended for hospital nurseries. That number isn't an official limit for the home. Three went above 85 decibels, a level that, if kept up for more than 8 hours, exceeds the occupational limit for adults. The study measured the devices' sound, not babies' hearing. If you use one, keep it far from the crib, at low volume and, if possible, for a short time.

## Humidifiers

They can help with a stuffy nose. The AAP mentions a cool mist humidifier, close enough for the mist to reach the baby but out of their reach. The US Environmental Protection Agency (EPA) adds a few precautions:

- **Avoid hot steam.** Hot water and steam can cause burns.
- **Keep it clean.** Bacteria and fungi grow in the tank and come out with the mist. Change the water every day and follow the manufacturer's cleaning instructions, usually every few days.
- **Prefer water with few minerals,** such as distilled, and avoid making the room too damp, because that encourages mold.

Without a stuffy nose or advice from your pediatrician, you don't need one. Don't add oils, essences or medicines to the water.

## When to talk to your pediatrician

> **Talk to your pediatrician if your baby:**
>
> - snores often, pauses in breathing or breathes with effort while asleep
> - sweats a lot while asleep, even with little clothing in a cool room
> - feeds less or has [few wet diapers](/en/blog/wet-diapers-per-day/), especially on hot days
> - has reflux or a stuffy nose that disrupts sleep or feeding
>
> **Seek care immediately** if your baby is very limp, hard to wake, having trouble breathing, has bluish skin, is very hot and not responding as usual, or has a fever and is under 3 months old.

With the room sorted out, the rest of sleep gets easier to understand. See also [how many times babies wake at night](/en/blog/baby-waking-up-a-lot-at-night/) and [what time babies go to bed](/en/blog/what-time-should-baby-go-to-bed/).

## FAQ

### What is the ideal temperature for a baby's room?

The UK's NHS gives 16 to 20 °C. The American Academy of Pediatrics gives no number, and that range is hard to keep in hot climates. On hot days, what helps most is ventilating the room, using little clothing, skipping blankets and checking that your baby isn't sweaty or hot on the chest.

### Can I leave a fan on in the baby's room?

Guidance varies. An American study linked fan use with a lower risk of sudden infant death, but it doesn't prove cause, and a leaflet from a British health service advises not leaving a fan in the room while the baby sleeps. Since the sources disagree, the simplest option is to cool the room before your baby sleeps. If the family decides to use one, don't aim it at your baby and keep the cord and device out of reach.

### Can a baby sleep on their stomach?

No. Babies should be placed on their back for every sleep until age 1, and the American Academy of Pediatrics considers the side position just as dangerous as the stomach. If your baby already rolls easily both ways, you don't need to turn them back during the night.

### Can I raise the crib for reflux or a stuffy nose?

No. The American Academy of Pediatrics advises that babies sleep on a flat surface, including with reflux, and considers any incline above 10 degrees unsafe. Wedges, towels and pillows under the baby or the mattress are not safe.

### Is a humidifier good for a baby?

It can help with a stuffy nose, and the American Academy of Pediatrics mentions a cool mist humidifier, out of the baby's reach. Change the water every day and follow the manufacturer's cleaning instructions. Avoid hot steam models, which can cause burns. Mold and bacteria are the problem with a dirty device.