Answer: The Hypothalamus
Explanation:
This is because it is responsible for the regulation of some metabolic processes and some activities of the autonomic system. It is responsible for the synthesis and secretion of neurohormones. It controls body temperature, sleep, thirst, circadian rhythms, hunger, attachment behaviors.
If the baby will not allow you to properly take their fever under their tongue, simply take the thermometer and get an underarm temperature. If the temperature is over 99-100, you should consider using a rectal thermometer.
Hope this helps! :)
Mr rynolds escaped your welcome