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Special caution is suggested for younger children. Pregnant women beware! Soaking in water above 102°F can cause fetal damage during the first three months of pregnancy (resulting in the birth of a brain-damaged or deformed child). Pregnant women should adhere to the 100°F maximum rule. Before entering the spa or hot tub, users should check the water temperature with an accurate thermometer; operating ther mostats may err in regulating water temperatures by as much as four degrees Fahrenheit. Pe