Comparison of Thermometry in Canada for Pediatrics

Inclusion Criteria: * Children Age 1 month to ≤ 10 years old * Male or female * Subject's parent or legal guardian over the age of 18 years must sign an informed consent form before any study-related procedures are performed * Subjects who in the opinion of the investigator (or as required by the ethics committee) have the capacity to understand and sign an assent form, must provide written assent Exclusion Criteria: * Subjects who in the opinion of the researcher are too agitated, distressed or who are otherwise unable to cooperate with study procedures * Subjects whose forehead cannot be fully exposed to the ambient condidtions for at least 15 minutes. * Subjects with signs or recent history of inflammation or infection of the forehead or at the reference clinical test site. * Subjects currently using cooling blankets or fans * Subjects with tubes in their ear(s) cannot participate in the tympanic comparison, but this is not exclusionary for InstaTemp MD and definitive comparator (e.g. rectal or oral) measurements. * Subjects currently receiving treatment with thyroxine, barbiturates, antipsychotics, cortico-steroids (oral iv, or topically applied to forehead) * Subjects currently alcohol intoxicated * Subjects with documented illicit durg use in the previous 5 days * Subjects that have had any hot or cold drinks within 15 minutes prior to a sublingual reading * Subject is taking any medication that in the opinion of the investigator may alter the temperature of the child * Subjects participating in a clinical trial of an investigational medicinal product within the last 30 days.