How to Know if Your Baby is Too Hot: Signs and Prevention

Babies are more vulnerable to temperature extremes because of their delicate bodies. To protect your little one, it’s important to know the signs of a baby being too hot and what to do in such situations to prevent overheating.

The signs of a baby being too hot can include:

  • Sweating, including damp hair and clothing,
  • Feeling hot to the touch,
  • Warm or flushed skin,
  • Rapid breathing, and
  • Restlessness.

The best way to gauge their body temperature is to feel their chest or back, as extremities like hands and feet may feel cool even if the baby is too warm.

Dressing your baby in too many layers, using heavy blankets, or exposing them to direct sunlight for extended periods can all contribute to your little one becomming too hot. It’s essential to keep your baby’s environment cool and well-ventilated and to choose appropriate clothing and bedding depending on the weather (learn more about taking your baby outside in hot weather here).

If your baby is too hot for an extended period of time, overheating becomes a potential danger. Overheating can cause serious illness, such as dehydration, heatstroke, and even Sudden Infant Death Syndrome (SIDS).

Signs of Baby Overheating

The signs of overheating are different from simply beeing too warm. Here are some key indicators to watch for:

Increased Body Temperature

One of the first signs to look for is an increase in your baby’s body temperature. Touch their chest or back to see if they feel unusually warm. If you’re unsure, you can use a digital thermometer to confirm. A body temperature above 37.5 °C (99.5 °F) could be a sign that your baby is overheated.

Red or Pink Skin

When your baby is overheating, their skin may appear red and flushed especially if their skin is fair.

Flushing can be especially noticeable in their cheeks or face.


A severely overheated baby may become unresponsive or seem less aware of their surroundings. If you are unable to rouse your baby or get their attention, this could be a sign that they are dangerously overheated.


Lethargy is another indication that your baby might be overheating. If your baby is drowsy, less active, or less interested in playing or feeding, this could be a warning sign.


An overheated baby may cry more than usual, expressing discomfort or distress due to the heat. Pay attention to changes in your baby’s crying patterns, especially if there are no apparent causes for their distress.


Vomiting can be a sign of overheating in babies. If your baby is vomiting without obvious reason and is showing other signs of overheating, it’s essential to quickly cool them down and seek medical attention if needed.

Breathing Difficulties

Overheating can cause your baby to experience breathing difficulties, such as rapid or shallow breaths. This can also be accompanied by an increased heart rate. Keep an eye on your baby’s breathing patterns and consult a doctor if there are any concerns.

Heat Rash

Heat rash is a common skin issue caused by overheating. If your baby develops tiny red bumps or blisters on their skin, this could be an indication that they are too hot. Keep your baby cool and dry, and consult a doctor if the rash doesn’t improve.

By being aware of these signs of overheating, you can take action to ensure your baby’s safety and well-being. Remember to keep their environment cool and comfortable, dress them accordingly to the weather, and monitor their temperature and overall health.

Causes of Overheating


Swaddling can provide comfort for your baby and help them sleep better. However, it’s essential to ensure that your baby doesn’t become too warm while swaddling. Keep an eye on their temperature by touch-testing their chest or back. If it feels hot or sweaty, it’s a good indication that your baby is overheating. Remember that tight swaddling can also restrict airflow, making it harder for heat to dissipate.

Excessive Layers of Clothing

While it’s essential to keep your baby warm and cozy, excessive layers of clothing can cause them to overheat. As a general guideline, your baby should wear one more layer than you do to stay warm. Be mindful of the fabric as well; materials like fleece and polyester retain more heat than cotton, which breathes better. Always check your baby’s skin temperature and adjust their clothing accordingly.

High Room Temperature

A high room temperature is another common cause of baby overheating. Ideally, the nursery temperature should be between 68 and 72 degrees Fahrenheit (20 to 22 degrees Celsius). Using a room thermometer can help you monitor and maintain a comfortable temperature. Be mindful of other heat sources such as direct sunlight, radiators, or heating vents, as these can cause your baby to become too hot, especially during sleep.

Impact on Health


Dehydration can occur when your baby is too hot and loses more fluids through sweating than they take in. Signs of dehydration in babies include a sunken soft spot on their head, fewer wet diapers, dry mouth, and tearless crying. Ensure your baby is adequately hydrated by offering more frequent feedings and monitoring their fluid intake.

Heat Exhaustion and Heat Stroke

Heat exhaustion is a milder form of heat-related illness that can develop when a baby is too hot for an extended period. Symptoms include irritability, excessive sweating, and rapid breathing. If left untreated, heat exhaustion can progress to heat stroke, which is a more severe and potentially life-threatening condition. Symptoms of heat stroke include a high body temperature (above 104°F), red, hot and dry skin, rapid heartbeat, and shallow breathing. If you notice any of these signs in your baby, it’s essential to seek medical attention immediately.

Sudden Infant Death Syndrome (SIDS)

Overheating is a risk factor for Sudden Infant Death Syndrome (SIDS), which is the sudden and unexplained death of a baby younger than one year old. To reduce the risk of SIDS, make sure your baby’s sleep environment is not too warm and avoid overdressing them. A reasonable room temperature for their sleeping area is between 68-72°F. Dress your baby in light, breathable clothing, and use a firm, flat sleep surface without loose bedding or soft objects that could potentially obstruct their breathing.

Remember to maintain a comfortable environment for your baby and monitor their temperatures regularly to ensure they remain healthy and safe.

Safety Measures

Choosing the Right Sleep Bag

When selecting a sleep bag for your baby, consider the TOG rating, which measures the bag’s thermal insulation. A higher TOG rating means more warmth, while a lower rating is more suitable for warmer environments. Choose a sleep bag appropriate for the season and room temperature. Sleep sacks are an excellent option for infants, as they prevent blankets from covering their faces and ensure they stay at a comfortable temperature.

Appropriate Clothing and Bedding

Dress your baby in lightweight, breathable clothing such as cotton to help regulate their body temperature. Avoid overdressing or bundling them in too many layers. Use breathable bedding materials like cotton or muslin. If you’re using blankets, provide no more than a single, thin layer. Remember that newborns need more warmth than older babies or toddlers, so adjust accordingly.

Checking Baby’s Body Temperature

Regularly check your baby’s body temperature by feeling the back of their neck or their chest. Their skin should feel warm, not too hot or cold. Sweating or damp hair can be a sign that a baby is too hot. If your baby is consistently warm or sweaty, you may need to adjust their clothing or bedding.

Regulating Room Temperature

Set your thermostat to maintain a comfortable room temperature for your baby. A range between 68°F (20°C) and 72°F (22°C) is generally considered appropriate, but your baby might require a different setting based on their individual needs. Utilize fans or air conditioners to help regulate room temperature during hot weather, and make sure your baby is not positioned near drafts or heating vents.

Considering Age Group Differences

Keep in mind that the appropriate temperature and bedding can vary depending on your baby’s age. Newborns generally need a slightly warmer environment, while older babies and toddlers can cope with a wider range of temperatures. Pay attention to your child’s individual comfort level and make adjustments as needed. As your baby grows, continue to modify their clothing, bedding, and sleep environment to ensure they stay safe and comfortable.

When to Seek Medical Help

As a parent, it’s essential to know when your baby might be too hot and when to seek medical help. Here are some signs to watch out for and actions to take:

If your baby has a fever, it is crucial to monitor their temperature. A fever is usually indicated by a temperature above 100.4°F (38°C) measured rectally. Keep an eye on their behavior and other symptoms. While a mild fever can usually be managed at home, you should contact your healthcare provider if:

  • Your baby is younger than 3 months and has a temperature above 100.4°F.
  • Their fever lasts more than 24 hours or continues to rise.
  • They appear lethargic, unresponsive, or have difficulty waking up.
  • They are showing signs of dehydration, such as a dry mouth, sunken eyes, or fewer wet diapers.

Dehydration can occur when your baby is too hot and losing fluids more quickly than they can be replenished. If you notice any of these symptoms, it’s essential to take action:

  • Encourage your baby to drink more fluids, either through breastfeeding or offering age-appropriate water or electrolyte solutions.
  • Keep your baby comfortable and cool. Dress them in light, breathable clothing, and maintain a cool room temperature.
  • Be attentive to their needs for rest, and monitor their recovery closely.

If your baby is unresponsive or appears to be in distress, it is crucial to seek immediate medical attention. Quickly assess their condition and call your healthcare provider or emergency services if you observe any of the following:

  • They are not waking up or reacting to stimuli.
  • They exhibit signs of extreme dehydration, such as shriveled skin or a weak, rapid pulse.
  • They are having difficulty breathing, or their lips and skin have a bluish tint.

Being confident, knowledgeable, and responsive in these situations will help ensure your baby’s well-being. Trust your instincts, and don’t hesitate to seek medical help if your baby’s condition is concerning or worsens. Being proactive in addressing these matters can make all the difference in your child’s health and comfort.


Morrongiello, B. A., & Kiriakou, S. (2004). Mothers’ Home-Safety Practices for Preventing Six Types of Childhood Injuries: What Do They Do, and Why? Journal of Pediatric Psychology, 29(4), 285–297.

V.A. Harpin, G. Chellappah, N. Rutter; Responses of the Newborn Infant to Overheating. Biology of the Neonate 1 February 1983; 44 (2): 65–75.

World Health Organization. Maternal and Newborn Health/Safe Motherhood. (‎1997)‎. Thermal protection of the newborn : a practical guide. World Health Organization.

Frequently Asked Questions

What are common signs of an overheated baby?

An overheated baby may show several signs, such as sweating, red or flushed skin, rapid breathing, and restlessness. If you notice these symptoms in your baby, it’s important to take action by removing excess layers of clothing and ensuring their environment is adequately ventilated.

Do babies cry when they feel too hot at night?

Yes, babies may cry when they feel too hot at night. Overheating can cause discomfort, leading to increased fussiness or crying. If your baby is crying and shows other signs of overheating, such as red or flushed skin, it’s possible that heat may be the cause.

How can I tell if my baby is too warm during sleep?

One of the quickest ways to check if your baby is too warm during sleep is to touch their chest or back, as this provides a good indicator of their body temperature. If their skin feels hot or sweaty, it’s likely they are too warm and need to have some layers of clothing removed or their environment adjusted.

What to do if my baby feels hot but doesn’t have a fever?

If your baby feels hot but doesn’t have a fever, it’s important to ensure they are not overheating. Make sure they are dressed appropriately for the ambient temperature and consider removing a layer if necessary. Additionally, provide a well-ventilated environment and monitor them closely for any other signs of distress.

Can overheating cause harm to my baby’s brain?

Overheating can be dangerous for babies, as it may lead to heatstroke, dehydration, and other health complications. It’s essential to keep your baby comfortable and avoid overheating to protect their overall health and development.

How to determine if a baby is too cold or not?

Babies should be dressed in layers to help regulate their body temperature. If their hands or feet feel cold to the touch, or if they are showing signs of lethargy or difficulty feeding, they may be too cold. To remedy this, add a layer of clothing or provide a warmer environment to help them maintain a comfortable temperature.

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