Parents and caregivers often have concerns about their baby’s health, especially when it comes to their body temperature. Knowing what constitutes a high temperature in a baby is crucial for ensuring their well-being. In this article, we will explore what is considered a high temperature in infants, the potential causes, when to seek medical attention, and how to care for a baby with a fever.

What is a High Temperature for a Baby?

A baby’s normal body temperature is slightly higher than that of adults, ranging between 97.5°F (36.4°C) and 99.5°F (37.5°C). A rectal temperature of 100.4°F (38°C) or higher is generally considered a fever in infants under three months old. For babies aged three to six months, a fever is typically defined as a rectal temperature of 101°F (38.3°C) or higher. However, these values can vary slightly from one healthcare provider to another.

Causes of Fever in Babies

Fever in babies can occur for various reasons, and it’s essential to understand the underlying causes. Common causes include:

Infections: Most fevers in infants are due to viral or bacterial infections, such as the common cold, flu, ear infections, urinary tract infections, or pneumonia.

Teething: Teething can cause a mild increase in body temperature. However, it’s usually not high enough to be classified as a fever.

Immunizations: Some babies may develop a mild fever after receiving vaccines, which is a normal reaction to the immune system’s response.

Environmental Factors: Overbundling or exposure to a hot environment can lead to elevated body temperature.

Dehydration: Infants are more susceptible to dehydration, which can result in an increased body temperature.

Underlying Medical Conditions: In some cases, fever can be a sign of a more serious underlying medical condition, such as meningitis or a urinary tract disorder.

When to Seek Medical Attention

While fever itself is not always a cause for alarm, certain situations warrant immediate medical attention. Parents and caregivers should seek medical help if:

Infants Under Three Months Have a Fever: Any fever in a baby under three months old should be evaluated by a healthcare professional, as it could indicate a serious infection.

High Fever: If a baby’s rectal temperature reaches 104°F (40°C) or higher, it is considered a high fever and requires prompt medical attention.

Persistent Fever: If a fever lasts for more than a day or two, or if it worsens instead of improving, consult a healthcare provider.

Additional Symptoms: If a baby has accompanying symptoms such as difficulty breathing, severe vomiting, a rash, lethargy, or signs of dehydration (such as decreased urine output or dry mouth), seek medical help immediately.

Seizures: If a baby experiences a seizure, particularly as a result of a high fever (febrile seizure), it is a medical emergency.

Caring for a Baby with a Fever

When a baby has a fever, it can be distressing for both the child and the caregiver. Here are some essential steps to care for a baby with a fever:

Comfort and Rest: Ensure that your baby is comfortable and well-rested. Dress them lightly in breathable clothing and maintain a comfortable room temperature.

Hydration: Offer plenty of fluids, such as breast milk or formula, to prevent dehydration. For infants older than six months, oral rehydration solutions may be used.

Medication: If recommended by a healthcare provider, administer the appropriate dosage of infant acetaminophen or ibuprofen to reduce fever and discomfort. Be sure to follow the dosage instructions carefully and consult a healthcare professional for proper guidance.

Sponge Bath: A lukewarm sponge bath can help lower a baby’s temperature. Avoid using cold water, which can cause shivering and raise the temperature further.

Monitor: Keep a close eye on your baby’s fever and overall condition. Note any changes in behavior, appetite, or symptoms, and communicate these observations with a healthcare provider if necessary.

Seek Medical Advice: If you’re unsure how to manage your baby’s fever or if you’re concerned about their condition, contact a healthcare provider for guidance.


Understanding what constitutes a high temperature in a baby is vital for providing appropriate care and ensuring their well-being. While fevers in infants are often caused by infections, they can also result from other factors. Knowing when to seek medical attention is crucial for addressing underlying issues promptly. Caring for a baby with a fever involves maintaining their comfort, hydration, and closely monitoring their condition. Remember that consulting with a healthcare professional is always advisable when dealing with a baby’s fever, especially in infants under three months old.


Kenny is the founder and editor-in-chief of TheTalka. He launched the site in 2019.

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