What are the symptoms of hepatitis B infection in infants?

Hepatitis B is an acute infectious disease caused by the hepatitis B virus, characterized by symptoms such as fever, headache, fatigue, diarrhea, and oral ulcers. Newborns may present with low-grade fever, irritability, diarrhea, persistent vomiting, febrile seizures, jaundice, and hepatomegaly. Infants may develop fever, pallor, reduced activity, lethargy, disturbed sleep, diarrhea, oral ulcers, poor appetite, skin erosion, cold extremities, decreased urine output, impaired circulation, and difficulty breathing. Additionally, infants may exhibit other symptoms such as lymphadenopathy and edema. If signs of hepatitis B are observed in an infant, prompt medical attention is essential. Regular monitoring of serum and biochemical indicators should be performed according to the infant's condition, and targeted treatment should be implemented accordingly.