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A compact position is typical for fetuses. Many newborn mammals, especially rodents, remain in a fetal position well after birth. This type of compact position is used in the medical profession to minimize injury to the neck and chest. Some people assume a fetal position when sleeping, especially when the body becomes cold. [1]
In obstetrics, position is the orientation of the fetus in the womb, identified by the location of the presenting part of the fetus relative to the pelvis of the mother. Conventionally, it is the position assumed by the fetus before the process of birth, as the fetus assumes various positions and postures during the course of childbirth .
The standard of women lying flat on their back originated in the early 19th century in the US, and was recommended by male obstetricians on the basis of claims that the position was both more convenient for attending medical staff and that women would be more comfortable lying on their backs.
Standish points out that lying flat on your back can create a narrowed or blocked airway, leading to snoring or sleep apnea. RELATED: Here's How Much Sleep You Actually Need for Optimal Health 2.
The sleeping position is the body configuration assumed by a person during or prior to sleeping. Six basic sleeping positions have been identified: [dubious – discuss] Fetus (41%) – curling up in a fetal position. This was the most common position, and is especially popular with women. Log (15%) – lying on one's side with the arms down ...
Sleep experts discuss which positions are best and worst for back pain, sleep apnea, pregnancy, acid reflux, and more. These 2 positions have the most benefits, doctors say Skip to main content
Supine: lying on the back on the ground with the face up. Prone: lying on the chest with the face down ("lying down" or "going prone"). See also "Prostration". Lying on either side, with the body straight or bent/curled forward or backward. The fetal position is lying or sitting curled, with limbs close to the torso and the head close to the knees.
It is during the third trimester that maternal activity and sleep positions may affect fetal development due to restricted blood flow. For instance, the enlarged uterus may impede blood flow by compressing the vena cava when lying flat, a condition that can be relieved by lying on the left side.