Fever: 24 Hour

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Out of No Where Fever

My 18 month old slept terrible last night, this morning he has a fever with no other symptoms of anything else, I felt around in his mouth and I feel no new teeth. And he acts like he feels fine unless he's trying to get to sleep, or stay asleep. He had his 18 month shots last Wed. could he just now be reacting to the shots? Any suggestions would be appreciated.