This product is advertised in a misleading fashion:it says that it is for all ages but it is not. Unfortunately I did not find that out until attempting to use it on my sister's visiting sick 12 week old baby.It's scary enough dealing with a baby's fever without hearing from every doctor that you talk to that the thing is inaccurate on infants. This should be acknowledged in the packaging not (as it is) buried in the fine print of the directions. It is also very difficult to follow the instructions, and we wasted quite a few of the probe covers trying to figure it out.DON"T BUY THIS AS PREPARATION FOR A NEW BABY. Go the old-fashioned rectal thermometer way, that's what your pediatrician would recommend.