Rectum is the most accurate.
My midwives recommended the Vicks Speed read thermometer.
An old fashion rectal one
Rectal are the most accurate.
We use the forehead thermometer! We don’t use rectal thermometers and she didn’t like it under her armpit.
Safety 1st 3 in 1 Nursery Thermometer
Use a digital one under the armpit or a laser one on the forehead. Although they say rectal is the most accurate, they advise not to use rectal thermometers in children anymore
I have a Kinsa. You can use it as rectal, under arm, etc
Safety first
The laser ones are the best from Amazon. Click a button and point at head and get an instant reading