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As a result of changes in hormone placenta increases the ratio of estrogen and progesterone. Estrogen makes the uterus more sensitive to oxytocin (the hormone that causes uterine contractions), because then you start to notice a sharp decrease by the end of pregnancy. Interaction of estrogen and oxytocin, apparently, "runs" the allocation prostaglandins softener cervix. Number of amniotic fluid in the last weeks of pregnancy decreases and a half liters of the seventh month to about a liter of delivery date. Thirty-ninth and fortieth weeks of pregnancy(thirty-seventh and thirty-eighth week of fetal life) Fruit In these last weeks of fetal organs continue to develop and prepare child for life outside the womb. Fruit increases fat and adds about half a kilo of weight. At birth the average baby weighs 3100 to 3.400 kilogramma,Although full-term normal weight baby may be in ranging from 2,500 to 4,500 kilograms. The average height of 51 newborn centimeterbut the growth from 46 to 56 inches - well within normal limits. During pregnancy weight of the fertilized egg increases in the six million again! Over the next twenty years the weight of your child grow only in twenty times.PlacentaThe mature placenta is flat and round, with a diameter of 15-20 centimeters and a thickness about 2.5 centimeters;its weight is about one seventh of the weight of the child. Weight and dimensions vary in proportion to the child. Party placenta implanted in the wall of the uterus (maternal side), rough and looks like a bloody, it is divided into segments, called cotyledon.But the aging of the placenta begins to appear solid inclusions (calcium deposits). From the fruit of the placenta is smooth, pale, shiny and covered with amniotic membrane. Amniotic and horionalnaya shell extends from the edge of the placenta and form a bag containing amniotic fluid and fetus. The part of the fetus can be seen branching umbilical veins and arteries, branching off from the umbilical cord and penetrate the placenta in various locations.
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