You're better off with a good old-fashioned mercury thermometer, like your parents used. It may take a little while to get a reading from a squirming child, but the reading should be accurate. In addition its signficantly less expensive. The main reason to take your child's temperature is to determine if it's above normal. The specific reading isn't what's important.
Fever is only a symptom of an illness rather than an illness itself.
Knowing that your child has a fever just lets you know that there is some kind of problem. Also look for other symptoms, such as a cough or a rash. Other Topics Health Watch is intended to provide general information only and should not replace the advice of a medical professional. You should contact your physician if you have questions about any of these topics.