All I can say is that once they are old enough to «follow the rules» and stay in bed and kinda quiet during sleeptimes (because you know they're not always sleeping for them).... (babywisemom.com)
With a memory feature recall, you can gauge if baby's temperature has gone up or down, and there's even a fever alert glow that illuminates when they've gone too far past 98.6 degrees — convenient for sleeptime temperature taking without waking the little one from slumberland. (policygenius.com)