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Fever in the Young Infant

Fever is the most common complaint of children who present to the emergency department. Approximately 12% of febrile neonates (aged 0–28 days) and young infants (aged 29—56 days) have serious bacterial infections (bacteremia, meningitis, urinary tract infections, pneumonia, bacterial gastroenteritis, and osteomyelitis). The evaluation and management of the febrile neonate and febrile young infant can be confusing. All febrile neonates require diagnostic testing, treatment with antibiotics, and hospital admission. The workup of the febrile young infant is more controversial. These patients should undergo blood and urine testing, but the need for lumbar puncture is controversial, as is the need for empiric antibiotic treatment. The disposition of these patients will depend on the results of these screening tests.