And yes as said above, armpit temp can give off an innacurrate reading as much as 2 degrees lower than the actual temp.
Rectal temp is best for newborns. If you can, take it rectally. 100.4 rectally is when you need to take baby in. Anything less is not a concern.
Newborns tend to run a bit warmer and it's not a "concern" till it's 101.0 for longer than an hour I believe I'd still call someone or take baby in it's concer enough for this mommie
If it's under the arm temp I believe you add one or two degrees. I'm pretty sure it's two though. I would call your on call pediatrician just to be on the safe side.
Does it have instructions on your discharge papers at what point to take baby in for a fever. Maybe try to find a 24 hour nurse hotline. My clinic has one I use it when my son is sick and Idk if I should bring him in.
Can you take your babys temp rectally?? They say thats a lot more accurate
My dr. Said not to worry unless it's over 100. I believe.