Fetal development - week after week

The whole period of pregnancy can be divided into three trimesters, the duration of each of which is 12-14 weeks. Fetal development continues throughout pregnancy.

The first and second week of pregnancy

Ends menstrual period, and a woman's body prepares for ovulation Ovulation - How to determine as accurately as possible? Which occurs approximately eleven - twenty-first day since the beginning of the last menstrual period. Within a few days after ovulation, the egg is in the fallopian tube, where a sperm fertilizes it. Approximately six to twelve days after conception, the fertilized egg attaches to the uterine wall - then begins the so-called embryonic stage.

The third week of pregnancy

Continuing the growth of the embryo, formation begins brain, spine, heart, gastro-intestinal tract of the child.

The fourth and fifth week of pregnancy

Begins the formation of limb stabilizes heartbeat. Begins to form the placenta, which throughout the entire period of pregnancy will serve as a "conductor" of nutrients and oxygen and produce a number of necessary hormones (including the so-called "pregnancy hormone" - human chorionic gonadotropin, which allow tests to confirm the pregnancy). The major blood vessels begin circulation of rudimentary blood formed the eyes and ears of the child. By the end of the fifth week of the length of the embryo is only six and a half millimeters.

The sixth week of pregnancy

Begins the formation of the lungs, jaw, nose, palate, in the form of rudimentary processes of extremities fingers. Ongoing development of the brain. On this term transvaginal ultrasound has to determine the baby's heartbeat. The length of the embryo is little more than a centimeter.

The seventh week of pregnancy

On the seventh week of pregnancy in the tiny body of the embryo begins to form all vital organs, while the embryo is still weighs less than ordinary aspirin tablet. Formed hair follicles, eyelids, tongue, becoming more distinct elbows and fingers, as the body grows.

The eighth week of pregnancy

The formation of the external and internal ear, now the embryo has all organs as an adult. Formed bone, muscle gain the ability to shrink, become distinct basic features, more pronounced - ever. In the eighth week of pregnancy, embryonic phase ends and begins the phase of the fetus. The length of the embryo is about two and a half centimeters.

The ninth - the thirteenth week of pregnancy

The fruit grows to eight centimeters long and weighs less than one gram. Finally formed genitalia while using ultrasound to determine at this stage of pregnancy sex of the baby is still difficult. Eyelids are serried (eyes only opened the twenty-eighth week of pregnancy). The fetus can compress jaws, teeth begin to form. The size of the head of the child at this stage of pregnancy is only half the size of the fetus.

Fourteenth - sixteenth week of pregnancy

At the head of the child's primary form, vellus hair. The fruit begins to suck the amniotic fluid (amniotic fluid). On the balls of tiny fingers formed individual "patterns" - future fingerprints in the gut - meconium (feces original). Already at this stage of pregnancy you can feel the movement of the child. Ends with the formation of sweat glands, liver and pancreas begin to produce the secretion. The size of the fetus reaches fifteen centimeters and weighs a little more than a hundred grams.

The seventeenth - twentieth week of pregnancy

At this stage of pregnancy the child's movements are distinct, they are easy to distinguish. Begin to grow eyelashes and eyebrows, fingers on the hands and feet are formed fingernails. The skin around the fetus at the twentieth week of pregnancy begins to produce vernix - a viscous whitish substance that protects the baby's skin from contact with amniotic fluid. You can distinguish the heartbeat using a standard stethoscope. The size of the fetus reaches twenty centimeters in length, and weight - about three hundred forty grams.

Twenty-first - the twenty-third week of pregnancy

Vellus hair now cover the whole body of the child, the fruit looks almost exactly like a newborn baby, as the skin becomes color, formed the subcutaneous fat layer. Finally formed the eye, liver, pancreas Diabetes and pancreas - the things you need to know . The size of the fetus reaches twenty-five - twenty-eight centimeters in length, weight - a little more than five hundred grams.

Twenty-fourth - Twenty-sixth week of pregnancy

At this stage of pregnancy, even premature birth does not mean the death of the baby - a premature baby to survive with medical help. The child develops sleep phrases Dreams: how to understand our dreams   and activity can be noted that the mother. A rapid development of the brain, the nervous system is formed so that it is able to control some body functions. The size of the fetus reaches thirty-five centimeters in length, body weight is almost a kilogram - begins the third trimester of pregnancy.

Twenty-seventh - thirty-second week of pregnancy

In the third trimester of pregnancy begins the very rapid growth of the fetus - at this stage it is rapidly growing belly. By the end of the thirty-second week of the size of fruit is already thirty-eight - forty-three centimeters in length, and body weight - almost two kilograms. Light has not formed until the end, but already keeps breathing rhythm. Finally formed bone, which is still soft and pliable. The child's body stores calcium, iron and phosphorus. Finally, open your eyes.

Thirty-third - Thirty-sixth week of pregnancy

Preparation for childbirth, the fetus is gradually rotated to position head down and very quickly gaining weight. With the skin disappear vellus hair, it becomes less red and wrinkled. The size of the fetus by the end of the thirty-sixth week, reaching forty-three - forty-eight centimeters, and the weight is increased to six hundred grams to two kilograms - three kilograms.

Thirty-seventh - the fortieth week of pregnancy

By the onset of the thirty-eighth week of pregnancy, fetal development is completed - now delivery may begin at any time. The fruit takes uterus almost completely. The mother's body provides the baby with antibodies Antibodies - "soldiers' immunity That will protect the newborn against disease in the first weeks of life. Forming of all internal organs - lungs continue to develop only up to the onset of labor. Weight of the child is the end of the pregnancy from three to four and a half kilos, length greater than fifty centimeters.