My Baby Can't Seem to Regulate Their Temperature
The short answer
Newborns and young infants have immature thermoregulation, meaning they cannot control their body temperature as efficiently as older children and adults. They lose heat quickly through their large head surface area and have limited ability to shiver or sweat effectively. This is normal and improves over the first few months of life. Dressing your baby in one more layer than you are comfortable in and keeping the room at 68-72°F helps maintain stable temperature.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
Newborns are most vulnerable to temperature instability. They rely heavily on their environment to maintain body temperature. Premature babies are even more susceptible due to less body fat and thinner skin. Dress your baby in one more layer than you would wear, use sleep sacks instead of loose blankets, and keep the room between 68-72°F (20-22°C). Check your baby's temperature by feeling the back of the neck or tummy rather than hands and feet, which are normally cooler.
Temperature regulation improves as your baby gains body fat and their nervous system matures. However, they still need help maintaining comfortable body temperature. Watch for signs of overheating (sweating, flushed cheeks, rapid breathing, damp hair) and being too cold (cool torso, mottled skin, fussiness). Adjust layers as needed.
By this age, most babies regulate temperature much better, though they still benefit from appropriate layering. Babies who are mobile and crawling generate more body heat through activity. You may notice they need fewer layers during active play. Continue to avoid over-bundling during sleep as overheating is a SIDS risk factor.
Toddlers have much better thermoregulation but may resist wearing appropriate clothing. They are better at generating heat through activity but still need appropriate clothing for weather conditions. Watch for signs of overheating during active play, especially in warm weather.
By this age, temperature regulation is well developed. Most concerns about thermoregulation at this age relate to environmental exposure (too long in the cold or heat) rather than immature body systems. Teach your child to communicate when they feel too hot or cold.
What Should You Do?
When to take action
- Your newborn's hands and feet feel cool while their torso is warm, which is normal circulation pattern
- Your baby's temperature fluctuates slightly with environmental changes but stays within normal range
- Your premature baby needs extra warmth support in the first few months
- Your baby sweats lightly on the head during feeding or sleep, which is a normal way to release excess heat
- Your baby seems to struggle with temperature more than expected for their age
- Your baby frequently has temperature readings above 99°F without illness or excessive bundling
- Your premature baby seems to need significantly more warmth support than peers
- Your baby's core body temperature drops below 97°F (36.1°C) or rises above 100.4°F (38°C) without an obvious environmental cause
- Your baby shows signs of heat stroke (hot dry skin, rapid pulse, lethargy) or hypothermia (cold skin, weak cry, slow breathing, not feeding)
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
Could My Baby Have Hypothermia (Low Body Temperature)?
A body temperature below 97°F (36.1°C) in a baby is considered low and may indicate hypothermia. Newborns are especially vulnerable because they lose heat quickly and cannot shiver effectively. Signs include cool skin, weak cry, lethargy, poor feeding, and in severe cases, mottled or blue-tinged skin. Mild hypothermia can be treated with skin-to-skin contact and warm clothing, but significant or persistent low temperature needs medical evaluation.
Baby Sweating a Lot - Excessive Sweating
Sweating in babies is common, especially on the head, because babies have a high density of sweat glands on their scalp and their temperature regulation is still developing. Sweating during feeding, sleeping, and crying is usually normal. However, excessive sweating during feeds (especially if the baby also breathes fast or tires easily while eating) can occasionally indicate a heart condition. If your baby sweats heavily with feeds AND has poor weight gain or breathing difficulties, mention it to your pediatrician.
Baby Always Has Cold Hands and Feet
Cold hands and feet in babies are almost always normal, especially in newborns. Babies have an immature circulatory system that prioritizes sending blood to vital organs (brain, heart, lungs) over extremities. This means their hands and feet can feel cool and even look bluish or mottled while their core body remains warm. This is called acrocyanosis and is completely normal in the first few months. As your baby's circulation matures, this improves. Check your baby's warmth by feeling their chest or back, not their hands or feet.
SIDS Risk Factors and Safe Sleep
SIDS is the unexplained death of a baby under 1 year old during sleep. While the exact cause remains unknown, the risk can be significantly reduced by following safe sleep practices: always place your baby on their back, on a firm flat surface, with no loose bedding, pillows, bumpers, or toys. The ABCs of safe sleep are Alone, on their Back, in a Crib. Room-sharing without bed-sharing for at least the first 6 months reduces SIDS risk by up to 50 percent.
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.