After a woman becomes pregnant, her body becomes increasingly burdened and she becomes easily fatigued and needs adequate sleep and rest. In the first trimester, lie in bed, no matter how you sleep, as long as you feel comfortable. However, after 12 weeks of pregnancy, as the uterus increases month by month, it is not advisable to lie on your back, but on your side, preferably on your left side.
Because when lying on your back, the enlarged uterus compresses the spine, which will cause compression to the inferior vena cava and abdominal aorta on one side of the spine, affecting the return of blood from the inferior vena cava to the heart, reducing blood return to the heart, reducing cardiac output, and affecting various organs. The circulation of the machine is reduced. If the blood supply is insufficient, the abdominal aorta is compressed, and the uterine artery pressure decreases. As a result, the uteroplacental blood flow is reduced and the placental function is affected, which is not conducive to the growth and development of the fetus. In addition, lying on your back can also compress the ureter at the entrance to the pelvis, causing poor urine flow and reduced urine output. Not only is this not conducive to the discharge of metabolic waste in pregnant women, it can also cause edema.
Lying on the left side can reduce the pressure of the enlarged uterus on the inferior vena cava, abdominal aorta and ureter, which is helpful to increase the amount of blood returned to the heart and stroke volume, so that the blood supply to the whole body is sufficient. Insufficient, it is beneficial to the growth and development of the fetus.