baby heat rash

Baby Heat Rash – Symptoms, Causes, Treatment, Prevention

Heat rash can appear suddenly and babies are more likely to get heat rashes than adults because their skin is not fully developed yet.

The medical name of heat rash is Miliaria, red skin and small bumps appear when skin gets too warm. Heat rashes are itchy, prickly, and uncomfortable.

In this article gives you all helpful information about heats rash in babies. Cause, prevention, and treatments.

Heat rash is a skin condition that develops when the baby’s skin gets too much heat. Heat rash occurs when sweat gland clogged and sweat stuck under baby’ skin.

What is baby heat rash?

Heat rash is a skin condition that develops when the baby’s skin gets too much heat. Heat rash occurs when sweat gland clogged and sweat stuck under baby’ skin.

When your baby gets too much heat, then their skin sweat which is a natural cooling process for human. If babies sweat gland and skin work normally, sweat simply comes out through pores.

But babies pores are small that can easily be blocked. Heat rash is a result of sweat tries to reach the surface of the baby’s skin.

The most common condition for heat rash is a hot and humid condition (summer). But heat rash can also occur when it’s cold if your baby wearing too many and tight clothes.

Heat rash isn’t a serious condition. It is normal if your baby gets heat rash and it will go away within a few days.

Why do heat rashes appear in babies?

Heat rashes appear when sweat gets trapped under the skin due to blockage of sweat gland.

The babies sweat gland is smaller so they cannot regulate the temperature of the body effectively. So babies are more likely to get heat rashes than adults.

Heat rash can also appear due to tight clothes, blankets, and swaddles. Heat rash can look dangerous, but in most cases go away without any treatment.

Babies are more likely to get heat rash due to some reasons.

  • They cannot regulate the temperature of the environment effectively due to the smaller sweat gland.
  • Small Babies have more skin folds which can trap sweat under the skin.
  • Babies cannot tell and take off their clothing when they feel the heat.
  • Babies sweat glands are not fully developed.

Types of heat rash

Heat rash mainly divides into three categories based on severity.

1. Miliaria Rubra

It is the most common types of heat rash occur in babies or adults. It happens when sweat glands blocked near the surface of the skin. In this sweats trapped just under the epidermis or dermis (second layer of the skin). This cause small bumps, redness of the skin and itching.

2. Miliaria crystallina

It is the least severe form of heat rash. This happens when sweats just under the top layer of the skin. This cause small white and clear blister like lesion appears on the skin.

3. Miliaria profunda

It is the most severe form of heat rash, but not common. this happens when sweats trapped under the deeper layer of the skin and sweat leeks in the other tissues. These types of rashes are very painful and feel an intense burning. Babies with Miliaria profunda may develop the signs of heat exhaustion and rash can be infected.


Rashes cause redness and it is easier to see so fair skin than dark skin. Tiny blister of heat rash is also called vesicles. Sometimes these vesicles turned into miliaria pustulosa. And these are more common in babies.

Babies with miliaria pustulosa are less able to sweat, so these babies are at a higher risk of heat-related illness.


The major symptom of the heat rash for most babies is a rash on the body part that had exposure to heat.

Heat rash can also be seen in the skin fold such as the neck.

Symptoms of heat rash include

  • Rash on red skin.
  • Small white blister on the large area of the skin.
  • Hot skin.
  • Small white and clear blister of sweats under the skin. They may not look white. These are symptoms of Miliaria crystallina.
  • Red bumps on red skin and irritated-looking patches of the skin. If baby scratches their skin this is due miliaria rubra because of miliaria rubra itches.
  • Deep blister which looks like a pimple, is miliaria profunda. These are usually skin colored.

Heat rash usually doesn’t cause too much discomfort and go away on your own. You may not need to see the doctor. Heat rash is obvious in hot and humid weather.


Heat rash goes on its own within a few days without any treatment. You can reduce a baby’s discomfort and speed up the healing process.

  • Move your baby to a cool and dry place.
  • Apply a cool compress to the heat rash or discolored skin.
  • Regularly check skin folds and rinse away sweat with cool water and then dried that area.
  • You can keep your baby naked when you around.
  • Keep your baby under air-conditioner or fans to keep baby’s skin cool.
  • Keep your baby well hydrated.
  • Replace soap with a mild cleanser.

You should not use creams on baby’s skin unless your doctor recommends that. Heat rash is not allergic. Using the cream in those conditions may not help.

If the heat rashes are severe that may not go away on their own, you should consult your doctor. Your doctor may provide cream or steroid to speed up the healing process.

If the rash infected that may cause fever and heat illness. For this, your doctor may prescribe antibiotics.

Risk factors

Risk factors of heat rash include

  • Wearing tight and warm clothes for this season.
  • Swadling in warm weather.
  • Living in a warm climate.
  • Baby is near a source such as heaters and heat lamps.
  • Baby is too much


You can reduce the risk factors by following these steps-

  • Do not spend too much time in the direct sun.
  • Use an air conditioner and fan to keep your baby cool.
  • You should check the baby’s skin temperature time to time.
  • Monitor baby’s sign of sweating, if baby sweating too much, move your baby to a cooler place.
  • Chose breathable clothes for your baby such as cotton cloths.
  • There is no need to cover your baby with a blanket in warm weather. So choose seasonally appropriate clothing for your baby.


If you have read this article you have an idea what are heat rashes, but if not you can read here.

Heat rash is a skin condition when sweat trapped under the skin, it may be severe if sweats trapped under the deeper layer of the skin. They are of different types categorize on the basis of the level of sweats trapped under the skin.

Heat rash appears in the baby due to overheating or over sweating of the baby. This can be due to tight clothing, swaddling and living in warm weather.

Heat rashes look like a small white blister on the large area of the skin, red bumps on red skin and irritated-looking patches of the skin and deep blister which looks like a pimple.

But you can treat heat rashes by simply moving your baby cool place, by making baby’s skin dry or using air-conditioner and fan in warm weather.

[expand title=”Source”] Mayo Clinic “Heat rash” “” American Academy of Pediatrics “Heat Rash” “”What to Expect the First Year, 3rd edition, Heidi Murkoff, and Sharon, Baby Skin Issues, and ConditionsThe Merck Manual Professional Edition “Miliaria.” “” American Osteopathic College of Dermatology “Miliaria” “” American Osteopathic Association ”How to beat heat rash” “”. [/expand]

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