What is considered the most accurate site for measuring body temperature in infants?

The most accurate site for measuring body temperature in infants is the rectum. Rectal temperature measurements are often regarded as the gold standard for assessing core body temperature in this age group. This is due to the rectum's close proximity to the body's internal organs, which typically reflects the true body temperature more reliably than other sites.

While other methods, such as temporal artery (forehead) and aural canal (ear) measurements, can be convenient and less invasive, they may not provide the same level of accuracy as rectal readings, especially in young infants. Oral cavity measurements are generally not recommended for infants, as they may not be able to reliably hold the thermometer in their mouth.

In summary, rectal temperature measurement is the preferred method for accurately determining body temperature in infants due to its reliability in reflecting the core body temperature.