Management of Febrile Neonates

Age-Specific Risk Considerations

Neonates under 28 days are at the highest risk for invasive bacterial infections, with delayed diagnosis associated with increased morbidity and mortality 3
The risk of serious bacterial infection in young febrile infants is 8-13%, with urinary tract infections being most common 3, 4
Bacterial meningitis risk is approximately 0.4% in this age group, though the consequences of missing it are catastrophic 5

The American College of Emergency Physicians recommends that when lumbar puncture is deferred in well-appearing febrile infants, antibiotics should be withheld unless another bacterial source is identified 1, 2, 6
Admission, close follow-up with the primary care provider, or a return visit for recheck in the ED is needed for febrile infants under 28 days 1, 2, 6

Do not rely on physical examination alone in neonates under 28 days—the threshold for full sepsis workup is appropriately low in this age group 3
Assuming a normal white blood cell count rules out bacterial infection is dangerous, especially in neonates 3
Never assume well-appearing status rules out meningitis—young infants may have meningitis without classic signs 7

Admit to hospital for observation and complete laboratory workup, including urinalysis with culture, blood culture, complete blood count with differential, and inflammatory markers 1, 2, 3
Withhold empiric antibiotics unless a specific bacterial source is identified on workup 1, 2, 6
Close monitoring for clinical deterioration during hospitalization is necessary 1, 2
Reassess need for lumbar puncture if clinical status changes or if cultures return positive 1, 2