How Long Should a Fever Last in a Child?

A fever in a child is a body temperature of 100.4°F (38°C) or higher. This elevation indicates the body’s immune system is actively working to combat an infection. While a child’s fever can be a source of concern, it generally signals that the body is effectively fighting off an illness.

Fever Duration by Age Group

The duration of a child’s fever varies significantly with age, influencing the appropriate course of action. For infants under three months, any fever of 100.4°F (38°C) or higher is a medical emergency requiring immediate medical attention. Fevers in very young infants can be the sole indicator of a serious, rapidly progressing infection.

For infants between three and six months, a fever warrants a doctor’s visit, especially if 102°F (38.9°C) or higher. Even if short-lived, professional medical advice is required to rule out underlying issues.

In older infants and children aged six months and up, fevers commonly result from viral infections. These typically resolve within two to three days, though they can sometimes last up to five. Most improve as the child’s immune system successfully fights off the virus. Fevers caused by bacterial infections might persist longer and often require specific medical treatment. For older children, their overall appearance and behavior are often more indicative of the fever’s seriousness than the specific temperature reading or duration.

Recognizing When to Seek Medical Help

Certain symptoms accompanying a fever signal the need for immediate medical attention. If a child exhibits severe symptoms such as difficulty breathing, a stiff neck, an unexplained rash that does not fade when pressed (non-blanching), seizures, a severe headache, confusion, or inconsolable crying, seek emergency medical care immediately. Signs of severe dehydration, including no wet diapers for an extended period or sunken eyes, also warrant urgent professional help.

Less urgent but concerning signs mean a doctor should be contacted within 24 hours. This includes a fever lasting more than 24 hours in a child younger than two years, or more than three days in a child two years or older. Other indicators include a fever returning after being absent for at least 24 hours, signs of dehydration like reduced urination, or worsening symptoms despite fever-reducing measures. Parents should also seek medical advice if their child appears unusually ill or lethargic, even if the fever is controlled.

Specific situations also necessitate medical consultation, such as a fever in an immunocompromised child, as these children are at higher risk for serious infections. A fever developing after recent travel or one unresponsive to fever-reducing medication should also prompt a call to the doctor. Ultimately, parents should trust their instincts; if there is any doubt or significant concern about their child’s condition, seeking professional medical advice is always appropriate.

At-Home Fever Care

Managing a child’s fever at home focuses on providing comfort and alleviating symptoms, rather than solely aiming to eliminate the fever itself. Keeping the child dressed in lightweight clothing and ensuring the room is at a comfortable temperature can help regulate their body temperature. Encouraging rest is also beneficial, though it is not necessary for a child to remain in bed all day.

Hydration is important, as fevers can lead to fluid loss. Offering plenty of fluids such as water, clear broths, or oral rehydration solutions helps prevent dehydration. Even if a child does not have much appetite, offering small, frequent amounts of fluids is important.

For fever-reducing medications, acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) are commonly used. Administer these medications based on the child’s weight and age, following the dosing guidelines provided on the packaging or by a healthcare professional. Acetaminophen can be given every 4-6 hours, not exceeding five doses in 24 hours. Ibuprofen is suitable for children over six months of age and can be given every 6-8 hours. Aspirin should never be given to children or teenagers due to its association with Reye’s syndrome, a rare but serious condition.

Certain practices should be avoided when caring for a child with a fever. Cold baths or ice packs can cause shivering, which paradoxically might raise the body temperature. Rubbing alcohol on the skin is dangerous because it can be absorbed through the skin or inhaled, leading to alcohol poisoning. Additionally, bundling a child excessively should be avoided, as this can trap heat and elevate their temperature. While these home care measures aim to provide comfort, parents should remain vigilant for warning signs and seek medical attention if concerns arise or if the fever persists beyond expected durations.