3.5 month old rectal temp of 100.6

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My baby has a temp of 100.6, I noticed his cheeks have been really rosy today. He’s still been very playful, eating, & having wet diapers. He was grouchy earlier bc he is teething really bad and was trying to bite my hand off. Should I call the pediatrician? His head or neck didn’t not feel hot to the touch, so I was super surprised that his temp is that high. I know typically 100.4 is considered a fever.