Why does my baby keep getting fever again after it subsides?

Generally speaking, fever refers to an elevated body temperature. Recurrent fever in infants may be related to an underdeveloped thermoregulatory center, an immature immune system, upper respiratory tract infections, infantile emergency rash (roseola), urinary tract infections, and other causes. It is recommended to seek timely medical consultation to identify the underlying cause and receive symptomatic treatment under the guidance of a qualified physician. Detailed analysis is as follows:

1. Underdeveloped Thermoregulatory Center

An infant's thermoregulatory center is not yet fully developed and is highly sensitive to changes in ambient temperature, making body temperature more susceptible to external influences. It is recommended to maintain a suitable indoor temperature and humidity, and avoid exposing the infant to excessively hot or cold environments.

2. Immature Immune System

An infant's immune system is not fully developed and has weaker resistance to pathogens, making infections more likely and resulting in fever. It is recommended to enhance the infant's nutrient intake to improve immunity.

3. Upper Respiratory Tract Infection

Upper respiratory tract infections are usually caused by viral or bacterial infections. Pathogens invade the respiratory tract, triggering an inflammatory response that elevates body temperature. As the pathogens are not completely eliminated, inflammation persists, leading to recurring fever. Symptoms typically include coughing, runny nose, and sneezing. Treatment usually follows medical advice to use medications such as compound paracetamol and amantadine tablets, isatidis root granules, oseltamivir phosphate capsules, and others.

4. Infantile Emergency Rash (Roseola)

Infantile emergency rash is usually caused by human herpesvirus 6 infection. Viral infection triggers an inflammatory response, causing elevated body temperature. Infants may experience recurrent fever before the rash appears. Symptoms generally include high fever, rash, irritability, etc. Treatment usually follows medical advice to use antiviral oral solutions, ribavirin granules, ibuprofen suspension drops, and other medications.

5. Urinary Tract Infection

Urinary tract infections are typically caused by bacterial infection. Bacterial infection triggers inflammation in the urinary tract, causing elevated body temperature. As the inflammation is not promptly controlled, fever recurs. Symptoms may also include frequent urination, urgency, and pain during urination. Treatment may follow medical advice to use medications such as cefuroxime axetil tablets, levofloxacin tablets, azithromycin dispersible tablets, and others.

In daily life, it is important to maintain a balanced diet to ensure the infant receives adequate nutrition. Additionally, cultivating good personal hygiene habits in the child, such as frequent hand washing, regular bathing, and changing clothes regularly, can help maintain good health.