Sam, ok but what can you say about hot tubs pregnancy issue? What I mean ... would it be ok for girl or woman during the pregnancy to take her time in hot tub or some kind of jacuzzi? Are there any temperature suggestions or restrictions? Or you can say only about technical part of hot tubs? My sister loves hot tubs, but she doesn't want to harm a baby.
I believe I've seen comments that it should be ok if the water temp is kept at typical body temperature and no higher but the only person whose opinion matters in this regard is her doctor who I assume she is meeting with regularly throughout her pregnancy.
We kept our tub at 100 in the winter with my wife being pregnant and she is fine. As long as you don't elevate your body temp you are OK. Since it is normally less than 30 in the winter where I live...Keeping the tub at 100 was never an issue.