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You are seeing a well-appearing 20 day old infant brought in for passing 4 stools instead of 6 today. The baby is full term, eating well, and there were no significant birth complications or maternal infections. Vital signs are rectal temperature 38.0 C, HR 140, RR 36, O2 sat 99% on room air. Physical exam is unremarkable except the right tympanic membrane is redder than the left.