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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.
Most doctors do not mind pregnant women flying during their first trimester; it is actually during the third trimester that pregnant women are told not to fly as it could trigger labor. Flying during the first trimester may be unadvisable if it involves too much stress which could harm the baby and the mother. It is also unadvisable if the woman has had a history of miscarriages or ill health. Flying may cause air sickness which pregnant women are particularly vulnerable to.