Which position during labor might cause maternal hypotension and fetal hypoxia?

Supine position

The supine position causes compression of the clients aorta and inferior vena cava by the fetus. This, in turn, inhibits maternal circulation, leading to maternal hypotension and, ultimately, fetal hypoxia. The other positions promote comfort and aid labor progress. For instance, the lateral, or side-lying, position improves maternal and fetal circulation, enhances comfort, increases maternal relaxation, reduces muscle tension, and eliminates pressure points. The squatting position promotes comfort by taking advantage of gravity. the standing position also takes advantage of gravity and aligns the fetus with the pelvic angle.