Nursery Temperature: The Ideal Range for Safe Sleep & Comfort

Nursery Temperature: The Ideal Range for Safe Sleep & Comfort

Written by the ChildBloom Pediatric Panel, FAAP | Medically reviewed | Last updated July 2026

The nursery is 74 degrees. Is that too warm? The nursery is 66 degrees. Is that too cold? You check the thermometer, you check the baby’s hands (they are cold — is the baby cold?), and you are not sure what to do.

The AAP recommends a nursery temperature of 68-72F (20-22C) for safe sleep. This range is based on the relationship between overheating and Sudden Infant Death Syndrome (SIDS), as well as the general comfort needs of infants.

This article explains the science behind the recommendation, how to monitor and maintain the ideal temperature, and common mistakes parents make.

PART 1: WHY TEMPERATURE MATTERS

1.1 Overheating and SIDS

Overheating during sleep is a recognized risk factor for SIDS. The mechanism is not fully understood, but hypotheses include:

• Overheating may deepen sleep to the point where the baby’s arousal response is impaired.
• Overheating may cause thermal stress that disrupts cardiorespiratory control.
• Overheating may be associated with face covering (excess bedding shifting over the face).

The AAP recommends:

• Room temperature of 68-72F (20-22C).
• Lightweight sleep clothing (a sleep sack with appropriate TOG rating).
• No blankets, quilts, or loose bedding in the crib.
• The baby’s chest should feel warm (not hot) to the touch.

1.2 Why Babies Are Vulnerable

• Higher surface-area-to-mass ratio: Babies gain and lose heat more rapidly than adults.
• Immature sweat glands: Babies cannot cool down as efficiently as adults.
• Limited behavioral responses: Babies cannot remove clothing, move to a cooler area, or communicate that they are too warm.
• Immature thermoregulatory system: The body’s temperature regulation system is not fully developed.

PART 2: HOW TO MONITOR THE NURSERY TEMPERATURE

2.1 Use a Thermometer

• Place a reliable digital thermometer in the nursery, at the baby’s sleeping level (not near a window, heater, vent, or direct sunlight).
• Check the temperature regularly — especially when the weather changes, when the heating or cooling system cycles on and off, and before putting the baby down for sleep.
• A thermometer-hygrometer combo (measures both temperature and humidity) is ideal.

2.2 Check the Baby

• Feel the baby’s CHEST (not hands or feet). The chest should feel warm, not hot or sweaty.
• Hands and feet are normally cool in babies — their circulation prioritizes the core. Cool hands do NOT mean the baby is cold.
• Signs of overheating: Sweating (especially on the chest, back, or hairline), damp hair, flushed cheeks, heat rash, rapid breathing, restlessness.
• Signs of being too cold: Cool chest, pale or mottled skin, unusual quietness.

PART 3: HOW TO MAINTAIN THE IDEAL TEMPERATURE

3.1 If the Room Is Too Warm

• Use air conditioning or a fan (do not point the fan directly at the baby).
• Dress the baby in lighter clothing (lower TOG sleep sack).
• Keep the room ventilated (open a window if outdoor temperature allows).
• Close curtains during the day to block solar heat gain.

3.2 If the Room Is Too Cold

• Use a space heater (with caution — keep it away from the crib and any flammable materials, and never leave it unattended).
• Dress the baby in warmer clothing (higher TOG sleep sack, footed pajamas).
• Ensure the room is well-insulated (check for drafts around windows and doors).
• Use a humidifier — humid air feels warmer than dry air and supports respiratory health.

3.3 Humidity

• Maintain humidity at 40-60%.
• Below 40%: Use a cool mist humidifier. Dry air causes dry skin, nasal congestion, and increased susceptibility to respiratory infections.
• Above 60%: Use a dehumidifier or air conditioning. High humidity promotes mold growth and dust mite proliferation.
• Use a hygrometer to monitor humidity.

PART 4: COMMON MISTAKES

1. Checking hands and feet instead of the chest. Cool hands are normal. Check the chest.

1. Adding blankets to the crib when the baby seems cold. Blankets are a suffocation risk. Instead, increase the TOG rating of the sleep sack or add a layer of clothing.

1. Setting the thermostat and forgetting about it. Room temperature fluctuates with weather, time of day, and HVAC cycling. Monitor regularly.

1. Using the “one more layer than you” rule for sleep. This rule is for outdoor clothing, not sleep. For sleep, use the TOG system.

1. Ignoring humidity. Temperature is only half the equation. Dry air causes discomfort and respiratory issues. Humid air promotes mold. Monitor both.

PEDIATRICIAN’S TAKE

68-72 degrees. That is the recommendation, and it exists for good reason. Overheating is a modifiable SIDS risk factor — meaning it is something parents can control. Use a thermometer, match the sleep clothing to the room temperature using the TOG system, and check the baby’s chest. If the chest is warm and dry, the baby is fine. If it is hot or sweaty, remove a layer. It is always safer to be slightly cool than slightly warm.

WHEN TO CALL THE DOCTOR

• The baby has a fever (100.4F / 38C or higher) — this is illness, not room temperature
• Signs of overheating that do not resolve after removing layers and cooling the room
• The baby is lethargic, pale, or has mottled skin (possible hypothermia)

RELATED ARTICLES

• How to Dress a Newborn for Sleep: The TOG Rating System Explained (Cluster 9)
• Best Nursery Lighting for Baby’s Circadian Rhythm
• The Pediatrician’s Complete Nursery Setup Guide

RECOMMENDED PRODUCTS

Best Nursery Humidifiers & Thermometers (Cool mist humidifiers, thermometer-hygrometer combos reviewed)

[See our top picks ->]

MEDICAL DISCLAIMER: This article is for informational purposes only and does not constitute medical advice. Always consult your pediatrician for guidance on safe sleep.

Related Resources

Explore more pediatrician-reviewed guidance from ChildBloom:

• The Pediatrician’s Complete Nursery Setup Guide: Safe Sleep, Air Quality & Essentials
• Do You Need a Nursery Glider? Ergonomics for Feeding & Back Health
• Best Nursery Lighting for Baby’s Circadian Rhythm
• Nursery Air Quality: VOCs, Formaldehyde & What an Air Purifier Actually Removes

Authoritative External Sources

• AAP Safe Sleep
• CDC SIDS
• AAP Fever

Frequently Asked Questions

Related: Baby Room Temperature Safe By Age