As a pediatrician with extensive experience in neonatal care, I can provide you with information on what is considered a fever in a newborn.
A fever in a newborn, or a baby less than 28 days old, is generally defined as a rectal temperature of 100.4°F (38°C) or higher. However, it's important to note that the definition of a fever can vary slightly depending on the source. Some medical professionals may consider a temperature of 100°F (37.8°C) or higher as a fever in a newborn. It's also crucial to remember that a fever is a symptom, not an illness, and it can be a response to an infection or other medical condition.
In infants, it's less common to use oral or ear thermometers because they may not be as accurate as rectal thermometers for measuring a fever. If a parent suspects their newborn has a fever, they should consult with a healthcare professional immediately, as even a mild fever can be a serious concern in a very young baby.
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