Prenatal Development Essay

Pregnancy occurs when an egg is fertilized by a sperm,and the egg grows privileged a womans uterus likewise c solelyed a womans womb, and impart develop into a cosset. In clements, this dish takes astir(predicate) 264 days, but the obstetrician impart date from the last menstrual catamenia or 280 days which is 40 calendar weeks. there atomic number 18 a number of things that mustiness fall into place in the chasten order to become pregnant and get hold of a violate. The creation of a human organism requires the regenerate-hand(a) environment, the right timing, the right factors, and a great deal of luck.The border intra-uterine pregnancy is used to describe when a fertilized egg is implanted in the uterus and an conceptus grows. The length of time of a pregnancy is divided into tercetsome sections called trimesters or stages, which is close to three months each. Each trimester has special(prenominal) events and developmental markers. The first trimester or bui lds the animal foot of the different organ systems. The first trimester or stage is the germinal hitch or the zygotic layover. It is the first two weeks of antepartum development. Near the end of the two weeks the single-celled a zygot, developes into a cluster of cells called the embryo.The countenance stage or trimester is called the embryonic period, which is week three through week eight. In the first month the embryo is unremarkably 1/8th of an inch or . 275 cm long. I weighs about 3 grams. A yolk sac has already formed at this stage. Organs and study systems within the dust of the embryo forms during this period. The embryos lifeline is the umbilical heapuroy, which turn in the embryo nourishment, oxygen, and water from the experience. The umbilical cord in any case carries away waste. The placenta is overly developed, protect the embryo, by keeping the mothers blood from mingling with the developing embryo.It also protects the embryo by preventing hurtful substa nces in the mothers blood from comer the embryo, such as teratogens. Teratogens atomic number 18 harmful substances that mickle cause nativity defects. By three weeks the babys head word cells have started to form, creating a sheet of anxious cells that curls and forms a uneasy tube lined with stem cells. At the top of the neural tube forms a bulge which subsequently consists of the hind hit, mid sensation, and fore mentality. When the neural tube expands, it creates ventricals and the core of the brain.Ventricals that are fill up with ceobraspinal fluid cushions the brain and also provides nutrients to the brain and spinal cord. In the second month, It is about an inch or 2. 5 cm long. It is 8. 7 grams heavy. The head, tail and the umbilical cord are formed and the sex glands are determined. The limbs, toes, fingers, the skeleton and bone cells have also been formed at this stage. A distinctively human appearance develops. Facial features, the chief(prenominal) organ systems also take shape. By the end of the eighth week, the structures of the brain, heart, liver, limbs, ears, nose and eye evolve.This is a most critical period of development. Harmful medications, drugs and alcohol may get the processes of development and cause defects or snags in the embryo. The fetal period or trimester is the tertiary month to actual birth of the baby. At this stage the baby is called the foetus with distinctively human features. At the end of the third gear month the baby arouse act as its arms, legs, mouth and head, although at this moment of time, the movements are uncoordinated and cannot be felt by the mother. The fetus is now one to three inches long and weighs roughly an ounce. The baby can also start using reflex action(a) responses .During the fourth month the mother can feel quickening, which is the baby moving inside the uterus. At five months all brain cells of the baby for birth are developed. During this period the baby has sleep and wak e cycles. In the sixth month the fetuss brain activity is similar to that of a young baby. The final two months the fetus usually doubles in weight. The fetus will usually add onabout three to four pounds of body fat. This additional body fat will help the neonate baby adjust to different temperatures extraneous the womb. The closer to birth, the fetuss increment slows and the actions of the body systems become more regular.At about forty weeks or 280 days, the fetus is ready to emerge in the world. At birth a babys brain is only one by the size of an adults brain. The brain will weight at birth less than a pound. After a baby is born the neurons grow in size and continue to develop. A rawborn enters the world with a array of bodily and sensory capabilities. In the beginning right at birth a babys behavior is mostly reflex moves that are to enable his survival in the new world. In conclusion, a baby is a very precious and oddity gift that some women are unsaved with. It is very mportant for a new gravid mother to understand the stages of pregnancy. A new mother should research and read all that she can read to gain association of what is going to happen in the months to come. The more knowledge a new mother has is very beneficial for her well being and also to interact with her physician about symptoms and problems if any arise.