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How to lower a baby's fever
Take your baby's temperature rectally.
If you think your baby is running a fever, use a rectal thermometer to get the most accurate results. Place your baby on his or her stomach, or on his or her back with legs pulled up.

Options:
+ Older babies can be on an infant's rectum if this is appropriate. You could also check for a fever by using a thermometer designed for infants.;
+ Coat the base of the thermometer with petroleum jelly, and insert it slowly into the anus-only about half an inch, so that the metal part is inside. Hold the thermometer still, and, when it beeps, remove it and read the results.;
+ Hold your thermometer up to your baby's neck and take a measurement of your baby's temperature. Take the thermometer down to your baby's neck and record the number three-five-five.;
+ If the thermometer is a digital thermometer, use it to help you get the most accurate measurement of your baby's temperature. Call your local emergency service if your baby is under four years old, or if your baby is over two years old.;
Coat the base of the thermometer with petroleum jelly, and insert it slowly into the anus-only about half an inch, so that the metal part is inside. Hold the thermometer still, and, when it beeps, remove it and read the results.