In US they basically discourage or warn people not to use sauna if they have any kind of condition, including being pregnant or have been consuming alcohol. In

In US they basically discourage or warn people not to use sauna if they have any kind of condition, including being pregnant or have been consuming alcohol. In Finland most pregnant women have always gone to sauna and they haven’t observed any kind of birth defects any more than elsewhere. Common sense applies and usually expected from adults in Finland. If you start to feel light headed or otherwise bad, you should leave the sauna and drink water or cool off.