Should a Baby with a Fever and Tonsillitis Receive Intravenous Therapy?

The baby had a fever of 39.8 degrees Celsius yesterday, received a small injection at the hospital, and took some ibuprofen. The body temperature was 38.5 degrees Celsius last night, 37.6 degrees Celsius this morning, and 38.7 degrees Celsius after the afternoon nap. Some anti-inflammatory medication was taken, and ibuprofen again. The tonsils were slightly inflamed, and blood tests showed no significant issues, indicating a viral infection. Should intravenous therapy be administered today?
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