During the third trimester (25 to 40 weeks), many healthcare providers and midwives advise staying within a 300-mile radius of home because of potential problems such as high blood pressure, phlebitis, and false or preterm labor.
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Most commercial airlines accept pregnant travellers up to 36 weeks if single pregnancy or up to 32 weeks if a multiple pregnancy. This is because labour is more likely after 37 weeks, or around 32 weeks if carrying an uncomplicated twin pregnancy.