Baby at Nine and a Half Months with a Fever of 38°, What’s Going On?

A nine and a half month-old baby suddenly developed a fever without any symptoms of a cold. The baby was not very interested in eating, but was not crying or restless, and was in good spirits. After applying a fever-reducing patch and taking 1.5 milliliters of Merck syrup, the temperature dropped to 36.9° before bedtime. However, by 4 am today, the baby’s temperature rose to 37.8° again. By noon today, the temperature rose to 37.9° again. Half a dose of Chai Gui fever-reducing oral liquid was administered, along with another fever-reducing patch. The temperature remains at 37.9°. Should the baby see a doctor, and what could have caused the fever?
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