Amniotic fluid is the fluid that surrounds the fetus. Amniotic fluid is 98% water and 2% salts and cells from the baby. A pregnant woman carries about 500-1000 ml of amniotic fluid. Until the fetal kidneys started working during month four, amniotic fluid is made by the mother’s body. But after month 4, the foetus started to make his/her contribution to the amniotic fluid by urinating into it. Successful pregnancy requires the accumulation of significant amounts of water, both to support fetal growth and to allow for maternal physiologic changes.
So let’s say amniotic fluid is to be found in the amniotic cavity. It completely surrounds the embryo after the 4th week of pregnancy. In this way it insures:
- Freedom of movement for the embryo.
- Space for development of the respiratory, digestive and musculoskeletal systems.
- Absorbs blows against the mother's abdomen.
- It has antibacterial properties that provide some protection from infection.
- Serves as a back up of nutrients and fluids for the baby.
- Protect the foetus from heat loss by helping to regulate the correct foetal body temperature.
- Keeps the embryo from sticking to the placenta. Towards the outside, the amniotic cavity is delimited by the amniotic epithelium, the chorionic leave and the deciduas’ capsularis.
Amniotic fluid is also important for the health of the mother. This fluid fills the whole womb, so as the foetus grows and gains weight, no pressure is exerted on the womb itself. If this fluid were not present, the growing foetus would weigh the uterus down and the counter-pressure exerted by the uterine walls would make the normal development of the foetus impossible.
If there is a single problem with the production of this fluid, with its continuous purification or the adjustment of its volume, the natural development of the foetus is impaired. For example, if the amount of amniotic fluid is less than required, or if it is not present at all, a series of abnormalities begins to appear. Limbs wither and become deformed, joints fuse, skin loosens and, because of pressure, the face is deformed. The most serious problem is that the development of the lungs is impeded and the baby dies immediately after birth.
In this pregnancy video section a whole range of videos are provided to watch which cover a whole range of subjects, from general pregnancy, complications, newborn care and even beauty.
Lowermilk, D., Perry, S. (2007). Maternity & Women's Health Care. 9th Edition. Mosby/Elsevier: St Louis, Missouri.
Underwood, M. A., Gilbert, Sherman M. P. (2005). Amniotic Fluid: Not Just Fetal Urine Anymore. Journal of Perinatology. 25, 341–348. http://www.nature.com/jp/journal/v25/n5/full/7211290a.html
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