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3 doctors weighed in: When during pregnancy should you stop laying on your back? 3 doctors weighed in Want a second opinion? At approximately 24 weeks you should avoid laying on your back for prolonged periods of time in order to avoid compression of veins (vena cava). In brief: 6 months.
Regardless of whether you are pregnant or not, exposure to the sun puts you at risk for premature aging and malignant melanoma (skin cancer). The following information will help you think through tanning in a bed, on the beach, or with help from a bottle. Some studies also link UV rays and folic acid deficiency. Folic acid prevents neural tube defects, such as spina bifida, and is especially important in the first trimester. During pregnancy, your skin is more susceptible to burning and chloasma, the dark splotches that appear on the face during pregnancy. Speak to your health care provider about the safety of tanning beds during pregnancy.