The present invention is directed towards a pacifier having a base section, an upper mouth member extending from the base section, a sublingual member extending from the base section, and a transition section connecting the upper mouth member and sublingual member. The upper mouth member is configured to be positioned adjacent a roof of a mouth of a user when in use. The sublingual member is configured to be received in a sublingual pocket of the mouth of the user located below a tongue. The transition section has a profile that defines a pocket configured to receive a portion of the tongue of the user, thereby opening the sublingual pocket and positioning the sublingual member of the pacifier in the sublingual pocket of the mouth. A temperature sensor is fitted to the sublingual member so as to acquire a body temperature of the user from the sublingual pocket.
