Which scenario in an infant requires urgent assessment?

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Infants under three months with fever require urgent assessment because serious infections can progress quickly in this age, and fever can be the only early sign of conditions like sepsis or meningitis. The immune system is immature at this age, so prompt evaluation and appropriate treatment decisions are essential. In the other scenarios, fever after exercise in an adult is usually benign, a child with a mild fever and dehydration can often be managed with fluids and observation unless dehydration is significant, and a teenager with fever alone is common and not typically an urgent red flag unless other concerning symptoms are present. The key point is that fever in a very young infant is a high-priority trigger for urgent clinical assessment.