We would never recommend to take a baby into a hot tub. Infants and toddlers under the age of four should not be permitted in a hot tub at all as babies’ thin skin makes them more susceptible to overheating. No young child should be allowed in a hot tub until they can stand on the bottom and have their head remain completely out of the water. Children who are big enough to be in a hot tub should not use it for more than five minutes at a time. It is also recommended that young children avoid full body immersion, choosing instead to sit on “rest seats” and should not be allowed to use a hot tub unsupervised.