Is It Advisable To Breast Feed An Infant Post Having Infrared Sauna?

Hello, my wife was in an infrared sauna at an hotel for half an hour. Is it fine for her to breastfeed our one year-old son? We're worried about potential toxins or radiation, but she wasn't in there for long and he's teething at the moment, which causes him to nurse a lot at night. Many thanks! Xander