Is it safe to sit in a hot tub while pregnant?

It's not a good idea unless you can control the temperature and set it at no more than 100 degrees Fahrenheit. Soaking in hot water or sitting in a hot, steamy room can make you overheat, which raises your heart rate and reduces blood flow to your uterus, potentially putting your baby under stress or interfering with normal development. And because pregnant women have a hard time cooling down, you're more likely to pass out if you get overheated in a hot tub or sauna — which would, of course, be very dangerous.