I have a smart things hub which is pretty good for this purpose - but the main problem is to make sure the baby's milk stays good so I would like confirmation a

I have a smart things hub which is pretty good for this purpose - but the main problem is to make sure the baby's milk stays good so I would like confirmation at the end of a power outage that the temperature is still acceptable. Luckily the power is reliable here, but as they say, winter is coming!