In feverish infants, which sign would indicate urgent assessment beyond simply age under 3 months with fever?

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In very young infants, fever plus potential illness can escalate quickly because their immune systems aren’t fully developed, so any red flags push for urgent assessment. Poor feeding is a sign that the baby isn’t taking in enough fluid and energy, which can lead to dehydration and indicate a more serious infection. Lethargy means the baby isn’t as responsive or active as expected, raising concern for systemic infection or sepsis. Dehydration shows the body is losing fluids faster than it can replace them, which can destabilize a tiny infant rapidly. Because each of these signs independently signals possible serious illness, their presence in a febrile infant under 3 months means urgent assessment is needed, so all of these signs indicate the need for prompt evaluation.