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Fifth Week of Pregnancy (5 pregnancy week five)

His little heart is developed inside the head and has eyes and soon form their limbs. You will notice early symptoms of pregnancy. In this week will measure 0.2 mm to reach 1.5 mm long

is forming the spinal cord and brain. The brain continues to develop until the child is 18 months. It is also beginning to form the ears. In the mother, was "delayed" menstruation and begins to think she might be pregnant. Her breasts are slightly swollen and sore.

At the end of the fifth week the head continues to increase in size to accommodate the rapid growth of the brain. The arms and legs are becoming more and more like an appearance at birth.

Also in this fifth week of gestation there 42 to 44 pairs of somites and their numbers used to calculate the approximate age of an embryo between 20 and 30 days old.

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Fourth Week of Pregnancy (4 week four pregnancy)

The embryo is less than a millimeter, but still does not look like a human. Only a disc consists of three layers of cells which will lead to different body tissues.

The innermost layer (endoderm) will form the respiratory and digestive systems. The middle layer (mesoderm,) will form the bones, most of the muscles, cartilage, sexual organs, kidneys and circulatory system. The outer layer (ectoderm) develop skin, hair and the system nervous.
This disc is folded to resemble a tube with two bumps at the ends, one of which will be the baby's head.
central nervous system, heart, skeleton and muscles are in their earliest stage of development.

This week, the heart becomes bigger and begins to pump blood. The head of the embryo is very large compared to the rest of the body. Has a tail that gradually shrinks until it disappears in the next three weeks. Appear also the beginning of the arms. Also the legs appear a little later, while the eyes and ears.

At the beginning of the fourth week, the cells that form the somites are modified, forming a tissue called connective tissue, which arise later cartilage-forming cells (chondroblasts), bone (osteoblasts) and supporting tissues (fibroblasts). Also give rise to the myotomes (which will be derived muscle) and dermatomal (of which will form the dermis and subcutaneous tissue).

At the end of the fourth week, the head is easily recognized, which already has a rudimentary brain, begin to recognize also the arms and legs. That emotion caudno

a mother knows that if a child is developing slowly, encourage and is giving love ...

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Third Week of Pregnancy (3 week three pregnancy)

Last week, the fertilized egg has divided into hundreds of cells and is now called a blastocyst. The blastocyst is hollow and filled with fluid, if now he could see inside your uterus, would hardly be visible.

Around the third week (usually between 4 and 7), the blastocyst is implanted in the endometrium, the lining of the uterus. Implantation in the uterus is an essential connection, the endometrium will provide nutrients to the developing embryo and eliminate waste. Over time, this implantation site will become the placenta. During pregnancy, the placenta nourishes and protects your developing baby.

already spent a week after fertilization. The blastocyst begins to secrete hormones that prevent your body from releasing the endometrial tissue in the uterus, so you may see that you had your period.

Adequate intake of vitamins, especially folic acid, protein, calcium and iron is essential for nourishing your baby. A folic acid supplement, which, ideally, will have been taking since before conception is particularly important because folic acid helps prevent neural tube defects (head, vertebral column and related structures) formed very early in pregnancy. If not consumed folic acid before please do not be alarmed, consult your doctor who will reset you some extra insurance.

protein intake, which is used to create new tissue, should be doubled during pregnancy should eat at least 60 grams per day. In addition, calcium is needed, at least 1,200 milligrams, for the development of bones and teeth, so be sure to eat a good amount of dairy products, leafy green vegetables. Iron is essential during pregnancy and supporting the continued growth of your baby's blood volume.

Below some anatomy the third week of pregnancy:
invagination of ectodermal cells continues and begin to migrate into the lamina procordal, forming a tube-like extension, called a notochord extension (precursor of the intervertebral discs). In the trilaminar disc flow will form the cloacal membrane (precursor of the year). In addition, they form a small tube, called a duct neuroentérico.

The embryonic disk, which is the initial stage is flat and round, gradually becomes longer and longer for the eighteenth day has a broad head end a narrow caudal end. At this stage, growth occurs mainly embryonic disc in the head region.

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Second Week pregnancy (2 week two pregnancy)

His second week of pregnancy your body is now very busy. Your uterus is preparing for the arrival of their baby. During the second week, their estrogen aunmenta at this time sending a message to your uterus to prepare for a future pregnancy. Your uterus will form a lining which is rich in blood for the egg to implant and start growing the placenta to nourish your baby.

Increased levels of progesterone prepare the uterus to support a fertilized egg. While all this happens, the ovaries begin to mature eggs in fluid-filled sacs called follicles. During this time you may notice when you are ovulating, you can feel the stitches in the side of his abdomen. Normally this is an indicator of ovulation, with the tenderness of their breasts. When the eggs are ready for fertilization, they are released from the follicles to begin your day in the fallopian tubes where they can meet the sperm of her dreams.

The sperm must be able to travel up through your reproductive tract, through your cervical mucus in the uterus, and through her fallopian tubes to reach the egg. Sperm must be able to complete the time within forty-eight hours or sperm will no longer be viable. If this does not happen and their eggs are fertilized during this time your uterus will begin to convert the monthly bleeding. As a result you start to menstruate and the cycle begins again.

"Pink or blue? The sex of your baby is determined at the time of fertilization, which occurs at the end of the week. Of the 46 chromosomes that make up your baby's genetic material, two chromosomes, one sperm and one egg, determine the sex of the baby. Each egg has an X chromosome sperm may have an X chromosome or a Y chromosome If the sperm has a X chromosome, have a child, if the sperm has a Y chromosome, your baby will be male.

While your baby was conceived, and is working a lot. The fertilized egg goes a process of division. Thirty hours after fertilization, divides into two cells, then four, then eight and continues to divide as you travel from the fallopian tubes to the uterus.
When it reaches the uterus, this group of cells and reaches 32 and is called a morula. One week after fertilization, there are 250 cells.