Poor quality medical care in some countries is an important concern, because of a lack of sterile equipment and lack of screening of blood products The safest time for travel is 18-24 weeks--after the risk of miscarriage and unpleasant nausea, but before problems such as premature labour Women with a previous history of miscarriage or ectopic pregnancy should be advised against travelling to countries where medical care is poor After 28 weeks a doctor's letter may be required before an airline will allow a pregnant woman to fly On board an aircraft, pregnant women should walk around the cabin at least once an hour to minimise the risk of deep vein thrombosis Malaria in pregnancy can be severe for both mother and fetus: chloroquine and proguanil have a long safety record Mefloquine is contraindicated in the first trimester and doxycycline should be avoided during pregnancy.
一些国家医疗服务质量低下是一个重要问题，这是由于缺乏无菌设备以及血液制品筛查不足。旅行的最安全时间是怀孕18至24周——此时流产风险和恶心不适已经过去，但早产等问题尚未出现。有过流产或宫外孕病史的女性应被建议不要前往医疗服务差的国家。28周后，航空公司可能会要求孕妇提供医生证明才允许其飞行。在飞机上，孕妇应至少每小时在客舱内走动一次，以将深静脉血栓形成的风险降至最低。孕期疟疾对母亲和胎儿都可能很严重：氯喹和氯胍有长期的安全记录。甲氟喹在孕早期禁用，孕期应避免使用强力霉素。
