If you intend to use a digital thermometer for rectal temperature reading, make sure that you get another one which you'll not use in future to take oral temperature. (newkidscenter.com)
Oral temperatures for kids generally range below 99.5 degrees F. for this, you should wait 30 minutes after your child has eaten or drunk anything. (newbornbabyzone.com)
Rectal temperatures measure higher than armpit temperatures, for example, and oral temperatures fall somewhere in between. (mommyish.com)