The amniotic fluid, a clear watery fluid that surrounds the fetus in the amniotic sac.
The fluid in which the fetus is suspended within its protective membranes inside the womb. Its primary roles are to safeguard the baby from external harm, regulate the baby’s temperature, and enable unrestricted movement. During labor, the fluid-filled membranes in front of the baby (referred to as the “bag of waters”) function as a wedge to facilitate the dilation of the cervix. This fluid is derived partly from the mother’s blood, partly from the membranes, and partly from the baby’s urine. Some believe it also provides nourishment, as the baby swallows it in the later stages of pregnancy. Typically, at the time of delivery, there is an average of one to two pints of this fluid, although it can be as little as half a pint. In a condition known as hydramnios, the amount can exceed four pints. This fluid is also referred to as amniotic fluid.