The first group, babies and toddlers, ages 0 to 2 years range from 36.
A low reading can be caused by an ear infection.
A known measure of liquid mercury, alcohol, or hydrocarbon-based liquid is vacuum-sealed in a glass tube.
When air is heated or cooled, the liquid expands or contracts.
This measurement is accurate and has low possibility for errors in the results.
The following ranges are based on an oral measurement.