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There's no problem with lifting during pregnancy as long as you use good body mechanics. Always lift with a neutral spine, never with a curved back. Because of the effects of progesterone on your body, your connective tissue, ligaments and tendons soften a bit during pregnancy, which puts you at greater risk of injury, especially from repetitive lifting or hard labor. Just use common sense and listen to your body, and you should be able to lift whatever you feel you can handle.
If you're at risk for other complications, though, such as placental separation, placenta previa or preterm labor, you should not lift at all.
Sleeping on Your Back
During pregnancy, sleep any way you can. You and your baby need the rest. Once you're in labor, you'll want to stay off your back to keep blood flowing to the placenta and to keep the weight of your baby-filled uterus from lying against your vena cava, which can make you feel light-headed. Until that time, though, lie and sleep in whatever position is most comfortable.
Air travel has never been shown to be hazardous to a developing fetus. If you're having a complicated pregnancy, you probably don't want to stray far from home or from your regular health care provider. Otherwise, fly on, but be sure to get plenty of fluids, plan frequent trips to the bathroom and stretch your legs a few times every hour. Try simple isometric muscle-strengthening exercises while you're confined to your seat.
At your week 26 prenatal visit, your health care provider will look for changes that may reveal a risk of preterm labor. With no risk signs, contractions or backaches, you should be able to stay in the air throughout your pregnancy. But carry a copy of your most recent prenatal record with you, just in case you need to consult another care provider or you go into labor in a strange city. Don't wait until you make it home to have low back pain, cramping or spotting checked out. Find a practitioner in the area you're visiting.