Children, particularly before puberty, don’t have the same ability to regulate their body temperature, so there’s definitely some watch-outs for younger kids with any kind of sauna as they are more at risk of heat exhaustion or heat stroke. We don’t allow children under 8 to use our sauna. Children between 8 and 15 can use it with a parent sitting in the room with them (not in the sauna, necessarily; but in the room). And young adults between ages 15 and 18 can use the sauna with a parent available in the building at all times.
We require the first 1-2 sessions for a minor to be limited to 15 minutes, just to see how their bodies react. If they can handle 15 minutes without any apparent negative effects of overheating, they can extend further sessions to 30 minutes. We do not allow sessions longer than 30 minutes for minors.
As always, remind your child about the importance of thorough hydration after use of a sauna.