(HealthDay News) -- If your child appears sick and might be running a fever, it's important to take his temperature properly.

There are different kinds of thermometers, but certain types may be better suited to your child's age range, the American Academy of Family Physicians says. Here are the group's recommendations:

• For children younger than 3 months, a digital thermometer should be used rectally. Electronic ear thermometers are not recommended, as ear canals are typically too small at this age to get an accurate reading.
• For children between 3 and 4 months, a digital thermometer used rectally or an electronic ear thermometer both should provide accurate readings.
• For children aged 4 and older, digital thermometers used orally will suffice. If the child has a cough, stuffy nose or has difficulty with an oral thermometer, an electronic ear thermometer or digital thermometer placed under the arm should work.