Parents often wonder, when do babies start sweating? You might be surprised to see your baby's hair damp, a sweaty forehead, or moisture around the baby's neck, particularly while sleeping or feeding. The good news is that sweating is a normal part of the body's temperature-control system.
Healthy full-term babies can actually sweat from birth. As babies grow, however, their sweating pattern can change as their temperature-regulating system matures. According to the Journal of Pediatrics, premature babies may have a less developed sweating response than full-term newborns.
Knowing what is normal sweating can help parents identify if their baby is just warm or if the sweating is linked to overheating, fever, dehydration or other health problems.
Table of Contents
Do Newborns Sweat at Birth?
Yes. Full-term babies can sweat shortly after birth. Most heat-related sweating occurs from eccrine sweat glands, which are present at birth and develop in utero. As babies grow and experience varying temperatures and levels of activity, their activity becomes more apparent.
Infants are less able to control their body temperature than older children and adults. Several mechanisms of temperature regulation are still developing during the neonatal period, and premature infants may have an even less mature response to heat (Van de Kamp & Daanen, 2025).
Due to these differences, the amount of visible sweat is not a good indicator of whether a newborn is comfortable or not. Parents should take into account the baby's temperature, clothes, surroundings, feeding and behavior.
When Do Babies Start Sweating? The Typical Age Timeline
There is no exact age when every baby suddenly begins sweating. Rather, the parents slowly begin to notice that their baby is sweating as he or she grows and becomes more active.
| Age | Common Sweating Pattern |
|---|---|
| Birth to 4 weeks | Sweating can occur, mostly around the forehead |
| 1 to 3 months | Head and neck sweating may become more visible |
| 3 to 6 months | Sweating may occur during feeding, crying, sleep, or movement |
| 6 to 12 months | Sweating may become more common as activity increases |
These ages are not milestones, but are general observations. Gestational age, environmental temperature, activity, clothing, and individual differences can all affect sweating.
Birth to 4 Weeks
Newborns sweat, especially from the forehead, but sometimes it's not easy to tell if there's moisture there. Premature babies may have a less developed sweating response due to less developed temperature control systems.
1 to 3 Months
Parents might see sweat around the scalp, forehead, or neck as babies spend more time awake and moving. Sweating can also be more noticeable in a warm room, with too much clothing on or with close physical contact.
3-6 Months
Babies are more active during this time. They may sweat when feeding as feeding is a prolonged activity and close contact may lead to increased warmth. Crying and vigorous movement can also temporarily increase body temperature and perspiration.
6 to 12 Months
Parents may observe sweating other than from the head as babies start to roll, crawl, sit and move more independently. During physical activity or hot weather, the back, chest and neck may become damp.
Why Babies Sweat Differently From Adults?
How do baby sweat glands develop?
Sweat glands form in the womb. Sweating and other temperature-regulatory responses are present at birth, but continue to develop throughout infancy.
Babies also have a relatively large surface area of skin in relation to their body mass, which also contributes to differences in heat gain and loss between babies and adults.
Eccrine Sweat Glands vs. Apocrine Sweat Glands
The eccrine glands are the main sweat glands responsible for cooling the body. They are found throughout the skin and are functional early in life.
Apocrine glands are primarily found in the armpit and are more active later in life, especially during puberty. Thus, the sweating parents observe in babies is mostly related to the eccrine glands.
Why Some Babies Sweat Earlier Than Others
There is considerable individual variation in sweating. The amount of sweat produced may be affected by gestational age, environmental temperature, physical activity, clothing, hydration, and general health.
A premature baby may thus sweat differently than a full-term baby of the same chronological age.
Common Baby Sweating Patterns Parents Notice
Babies Sweat on Their Head First
The forehead and scalp are common places for parents to notice sweat. Studies of infant thermoregulation have shown that sweating is especially evident around the forehead area in young infants.
If your head is sweating, it doesn't necessarily indicate a problem. The temperature of the surroundings and the clothing of the baby should also be taken into account.
Why Do Babies Sweat While Sleeping?
Overdressing, too many blankets, and warm sleeping conditions can cause babies to get too hot while sleeping. If the baby's hair is damp or his/her neck is sweaty, it means that the baby is too warm.
Don't over blanket or layer to make up for cool hands and feet. When determining if the baby is too warm, however, look at the chest, back or neck.
Why Do Babies Sweat While Feeding?
Physical exertion is needed to feed and body contact can lead to higher temperatures. Some babies get a wet forehead or a sweaty hairline when they feed.
Sweating a little every now and then is normal. If sweating continues or is excessive during feeding, particularly if there is rapid breathing, fatigue, difficulty with feeding, or poor weight gain, however, it should be discussed with the pediatrician.
Why Do Babies Sweat When Crying or Moving?
Temporary increases in heat production occur with crying, kicking, rolling and other physical activity. It may be normal for them to sweat after a lot of crying or activity.
If sweating is disproportionate to the activity or occurs together with other concerning symptoms, medical advice is appropriate.
Baby Sweating vs. Overheating
Sweating can be one indication that a baby is too warm. Other symptoms may be hot skin, flushed skin, irritability, unusual tiredness, or dehydration.
According to Centers for Disease Control and Prevention (CDC), infants and young children are at increased risk for heat-related illness and rely on caregivers to maintain the temperature of their surroundings at a proper level.
A baby's hands and feet can be cold even if the baby feels warm. Gently check the neck, chest or back rather than just the extremities.
If these areas are hot and sweaty, take off an extra layer of clothing and take the baby to a cooler place.
If your baby seems overheated, transfer him or her to a cooler area and take off excess clothing or blankets. Continue breast milk or formula feedings as usual.
If your baby is under 6 months and is breastfed, they usually do not need extra water, as breast milk contains enough water to keep them hydrated.
If the baby is very sleepy, hard to awaken, has trouble breathing, vomits often, or has serious dehydration or heat illness, get emergency medical help.
Baby Sweating vs. Fever: What Parents Should Know
Why Sweat Alone Does Not Mean Fever
Sweating may be due to heat, crying, feeding, exertion or sleep. So, sweating alone does not indicate a fever in a baby.
According to the guideline provided by American Academy of Pediatrics, parents should check the baby's temperature with a thermometer if they think the baby has a fever, not by checking the baby's skin temperature or by checking if the baby is sweating.
How to Take Your Baby’s Temperature Correctly
When taken properly, rectal temperature is the most accurate measurement for young infants. If a baby under 3 months has a temperature of 100.4°F (38°C) or above, seek medical attention immediately.
Parents should use a thermometer as directed by their pediatrician.
Fever Signs That Need Medical Attention
Prompt medical assessment should be provided for any baby under 3 months who has a temperature of 100.4°F (38°C) or above.
Other symptoms that may be concerning are difficulty breathing, unusual sleepiness, poor feeding, repeated vomiting, dehydration, or a significant change in behavior.
When Baby Sweating May Be a Warning Sign
Some sweating during feeding may be harmless, particularly in a warm environment. But, if a baby is sweating a lot during feeding, this should not be overlooked.
If the child sweats during eating or has trouble eating, unusual tiredness, fast breathing, or fails to gain weight, it is particularly important to consult with a pediatrician.
If the sweating continues, and breathing is rapid or difficult, if the baby gets tired while feeding or doesn't gain weight, the baby should be assessed by a doctor. These symptoms can sometimes occur with cardiovascular or respiratory problems.
A damp head or neck during sleep can simply mean a baby is too warm. However, repeated soaking night sweats, particularly when associated with fever, persistent cough, poor growth, breathing problems, or unusual tiredness, should be discussed with a healthcare professional.
Not sweating does not automatically indicate a medical problem. However, if a baby appears unable to cool down in a hot environment or develops signs of overheating, parents should seek medical advice.
Possible Causes of Abnormal Baby Sweating
Overdressing is one of the most straightforward explanations for excessive sweating. Body heat can be increased by heavy blankets, layers of clothing, hats in the house, and warm rooms.
Changes in body temperature and sweating can occur due to infection. But, sweat is not enough to diagnose an infection. A thermometer and the baby's other symptoms are more helpful.
If the child continues to sweat during feeding, fast breathing, trouble feeding, fatigue or poor weight gain, it is a good idea to get a pediatric evaluation.
Sweating may be caused by rare developmental, neurologic or skin disorders. These are rare and usually cause a more regular or unusual sweating pattern rather than sweating on a hot day.
Certain drugs and diseases may impact sweating. Parents should inform their healthcare provider about persistent changes in sweating and any medicines their baby receives.
How to Keep Your Baby Comfortable and Prevent Overheating
Wear light, airy clothes suitable for the room temperature. Do not add additional blankets or layers just because hands or feet are cold.
Parents should also adhere to safe sleep guidelines when it comes to sleep, such as putting babies on their backs on a firm, flat sleep surface and avoiding soft bedding.
When it is hot, avoid direct sunlight and use a cool, well-ventilated space as much as possible. Adults must protect infants from excessive heat. Do not leave a baby alone in a parked car as the temperature can quickly climb.
Heat rash is a result of blocked sweat ducts. Maintaining a cool and dry environment, avoiding over-clothing, and using loose, breathable fabrics will help minimize risk. Focus on areas where moisture tends to build up, such as the neck, armpits, and skin folds.
Continue regular breast milk or formula feeds during hot weather. For breastfed babies under 6 months, extra water is not recommended. Never add additional water to infant formula as this may affect the nutritional and electrolyte requirements of the infant.
When to Call a Doctor about Baby Sweating
If the sweating is ongoing, excessive, or if it happens while the baby is eating, parents should seek advice from a health care provider.
Medical evaluation is particularly important when sweating occurs with:
- Shortness of breath
- Difficulty feeding
- Poor weight gain
- Unusual sleepiness.
- Repeated vomiting
- Fever
- Signs of dehydration
- Unable to endure normal activity
If the baby is less than 3 months old, a rectal temperature of 100.4°F (38°C) or above should be quickly evaluated by a medical professional.
If a baby has a lot of trouble breathing, is hard to wake, looks very sick or dehydrated, seek urgent medical attention.
Conclusion
So, when do babies start sweating? Full-term babies can sweat from birth, but may be more noticeable as they get older and more active. Sweating is especially prevalent on the head and forehead in infants.
Most sweating is associated with normal temperature regulation, feeding, crying, sleep, activity, and environmental warmth. Parents should concentrate on the baby's general condition and not on sweating.
Reference List
- American Academy of Pediatrics (AAP). Safe Sleep and Skin-to-Skin Care in the Neonatal Period for Healthy Term Newborns. https://publications.aap.org/pediatrics/article/doi/10.1542/peds.2016-1889/52741/Safe-Sleep-and-Skin-to-Skin-Care-in-the-Neonatal?autologincheck=redirected
- American Academy of Pediatrics (AAP). Fever and Your Baby. https://www.healthychildren.org/English/health-issues/conditions/fever/Pages/Fever-and-Your-Baby.aspx
- Centers for Disease Control and Prevention (CDC). People at Increased Risk for Heat-Related Illness. https://www.cdc.gov/heat-health/risk-factors/index.html
- International journal of environmental research and public health. Narrative Review on Infants' Thermoregulatory Response to Heat. https://pmc.ncbi.nlm.nih.gov/articles/PMC12386404/
- The Journal of pediatrics. Sweating in preterm babies. https://doi.org/10.1016/s0022-3476(82)80768-3