Ideal Room Temperature for Baby
The short answer
The ideal room temperature for a sleeping baby is between 68-72 degrees F (20-22 degrees C). A room that is too warm increases the risk of SIDS. Dress your baby in one layer more than you would wear comfortably, and check their chest or back of neck to assess temperature rather than hands or feet.
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By Age
What to expect by age
Newborns cannot regulate their body temperature well. Keep the room between 68-72 degrees F (20-22 degrees C). Dress baby in a onesie plus a sleep sack or one light layer more than what you would be comfortable in. Check baby's temperature by feeling their chest, back, or the back of their neck: these should feel warm but not hot or sweaty. Hands and feet are normally cooler and are not reliable indicators. Avoid placing the crib near windows, heaters, or air conditioning vents. Overheating is a risk factor for SIDS.
Continue maintaining a comfortable room temperature of 68-72 degrees F. Baby's temperature regulation is still immature. Watch for signs of overheating: sweating, damp hair, flushed cheeks, heat rash, or rapid breathing. Also watch for signs of being too cold: fussiness, cool chest, or mottled skin.
Baby's temperature regulation improves but remains immature. Continue maintaining the recommended room temperature. Adjust clothing layers with the seasons. A sleep sack is a safe alternative to blankets for warmth.
Temperature regulation continues to mature. The same room temperature guidelines apply. A sleep sack remains the safest option for warmth, as loose blankets should not be used until after age 1.
What Should You Do?
When to take action
- Baby's hands and feet feel cool while the chest is warm
- Mild skin mottling when exposed to slightly cooler temperatures that resolves when warmed
- Baby sleeps comfortably in one layer plus a sleep sack
- You are unsure how to dress your baby appropriately for sleep
- Baby seems persistently too warm or too cold despite adjustments
- Baby frequently wakes seeming uncomfortable with temperature
- Baby is overheating: very hot to touch, sweating heavily, lethargic, or unresponsive
- Baby's body temperature is above 100.4 degrees F (38 degrees C) rectally, which may indicate fever rather than environmental overheating
- Baby is hypothermic: cool chest, lethargic, or not feeding well
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Medical Concerns
Overdressing and Overheating Baby
Overdressing and overheating are common concerns and a risk factor for SIDS. Dress your baby in one layer more than you would wear comfortably. Signs of overheating include sweating, damp hair, flushed cheeks, heat rash, and rapid breathing. Check your baby's chest or back of neck to gauge temperature.
Safe Sleep Position for Newborns
The safest sleep position for babies is on their back, on a firm flat surface, for every sleep. This recommendation from the AAP significantly reduces the risk of SIDS and sleep-related deaths. Always place your baby on their back until they can roll both ways independently.
Safe Swaddling Practices
Swaddling can soothe newborns by mimicking the snug feeling of the womb, but it must be done safely. The swaddle should be snug around the chest but allow room at the hips for natural movement. Stop swaddling as soon as baby shows any signs of rolling, typically around 2-4 months.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.