Frida Baby Quick-Read Digital Rectal Thermometer for Accurate Infant Temperature Readings, Fevers and newborns are not a good mix. But, knowing their temp, and knowing it quickly, is. The Quick-Read Rectal Thermometer gives you fast and accurate rectal temperature readings in just 10 seconds. Safe flexible tip and stopper make it parent-proof. Parent-proof rectal insertion stopper to keep you from inserting too far, and a large display with a backlight makes nighttime temp checks easier.