Unfortunately, there is no clear answer in those only a few months old.
Pediatrician Perri Klass writes about the gray zone in infants between 1 and 3 months old having fevers right around 100.4 Fahrenheit. There are no strict guidelines in these borderline cases, as both conservative and more aggressive interventions are defensible.
Studies aren’t helpful, as “there’s a tremendous amount of conflicting data about which babies need which tests and treatments.”
It is when babies “age out” of this gray zone that a more concrete approach presents itself.
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I disagree. There is good evedence in the Baraff criteria on fevers in pediatric patients. UCLA protocol or Baraff protocol in fever without a source has been found to be statistically reliable in terms of its use in pediatric patients who have fever without identifiable source.