Infants and toddlers should not be allowed in a hot tub and small children should not be allowed in for longer than 5 minute intervals due to the high temperature of the water (between 101 and 104 degrees). Children have thinner skin and are more succeptible to hyperthermia. A child should be monitored to make sure they don't exhibit signs of hyperthermia (dizziness, fainting or even unconsciousness).