I am really confused about which thermometer to use on my 8 week old son. I have the digital ear thermometer, the temporal one and the under arm one. When I take my sons temperature all three give me different readings, I don't know which one to trust. Does anybody know which of these three is the most accurate? Should I buy a digital rectal thermometer? I don't feel confortable using a rectal glass thermometer, they take too long and I don't think my son will stay still for that long. Any suggestions?