There are several methods to measure a child's temperature, including oral, rectal, axillary (underarm), tympanic (ear), and temporal artery (forehead) thermometers. Each method has its pros and cons, and the choice may depend on the child's age and comfort level. For infants, rectal measurements are considered the most accurate, while older children might prefer oral or tympanic thermometers. Always ensure the thermometer is clean and follow the manufacturer's instructions for accurate readings.