# Baby Room Temperature and How to Set Up a Safe Sleep Space

> The right nursery temperature, what baby should wear to sleep, and a checklist for a safe crib or bassinet.

Stage: newborn - Topic: Sleep - Page: https://www.askcladle.com/guides/newborn/room-temperature-and-sleep-environment

Grounded in: AAP 2022 safe sleep policy statement and AAP HealthyChildren safe sleep guidance, NIH Safe to Sleep campaign, and CPSC infant sleep product rules. Summarized in Cradle's own words; none of these sources endorse Cradle. General information, not medical advice.

Reviewed: 2026-11

## TLDR

- Aim for a room comfortable for a lightly dressed adult (about 68-72°F) and avoid overheating. No hats for sleep indoors.
- A onesie plus an unweighted sleep sack covers most nights. No loose blankets in the first year.
- Use a safety-standard crib with a firm, snug mattress and fitted sheet only, and keep the home smoke- and vape-free.

## Room temperature

- Aim for a room that is comfortable for a lightly dressed adult. Many pediatric sources suggest
  roughly 68-72°F (20-22°C). There is no single magic number; the main goal is avoiding overheating.
- Feel the baby's chest or back of the neck rather than the hands. Sweating, damp hair, flushed
  skin or rapid breathing mean too warm.
- No hats indoors for sleep after the first hours in the hospital. Babies release heat through the head.
- A fan that moves air gently is fine. Keep it, and any heater, well out of reach and away from the
  crib, with cords secured.

## What to dress them in

- A onesie plus a sleep sack, or a footed sleeper, covers most nights. In a warm room, a diaper and a
  light sleep sack is enough. In a cool room, add a layer underneath.
- Sleep sacks come in warmth ratings (often called TOG). Lower numbers for warm rooms, higher for
  cool. Unweighted only.
- No loose blankets until at least the first birthday.

## The sleep space checklist

- A crib, bassinet or play yard that meets current safety standards. Since 2022, US federal rules
  ban inclined sleepers and padded crib bumpers.
- Firm, flat mattress that fits snugly: no gap wider than two fingers at the sides.
- A fitted sheet made for that mattress. Nothing else: no pillows, positioners, wedges, bumpers or toys.
- In the parents' or caregiver's room, separate surface, ideally for at least the first 6 months.
- Away from windows, blind cords, curtains, and wall hangings or shelves above the crib.
- Baby monitors, if used, mounted well out of reach with cords at least 3 feet (90 cm) away.
- Wearable monitors that track oxygen or heart rate are not shown to prevent SIDS and aren't a
  substitute for safe sleep basics.

## Light and sound

- Dark for nights and long naps. Blackout curtains help in summer and for shift-working households
  where babies nap in daylight.
- A dim, warm-toned night light for feeds and changes.
- Steady background sound is optional; see the white noise guide for safe volume.

## Smoke and air

- Keep the home and car completely smoke-free and vape-free. Smoke exposure, before or after birth,
  is one of the strongest risk factors for sudden infant death.
- In dry climates or heating season, a cool-mist humidifier can ease stuffy noses. Clean it daily
  and keep it out of reach.

## Shared rooms and small homes

- Many families share a room with siblings or other relatives. That's fine. The baby still needs
  their own flat, clear sleep surface, and older children shouldn't put toys or blankets in it.
- A play yard works well as a full-time sleep space in small homes and when travelling.

## When to check in

- Ask at a checkup if you are unsure whether a product, mattress or hand-me-down crib is safe, or
  how to adapt safe sleep to your home.
- A baby who is unusually hot, limp or hard to wake needs urgent care; if they are not breathing
  or are blue, call 911.