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What happens during a pregnancy?

A pregnancy (or graviditd, from lat. graviditas or gravidus) denotes the condition of a woman who begins fertilization of the egg and ends the birth of a child.
The pregnancy in humans lasts on average 266 days, taken together 38 weeks and therefore more, than the actually known nine months. In fact, it depends on whether you go to calendar month (every month with 30/31 days) or lunar Calendar (28 days per month) counts. In the case of the calendar months, one has a fifth week again and again in some months, which then gives the impression that a pregnancy lasts exactly nine months (for example, from January to September).
Only very few newborns actually arrive calculated date of birth to the world. This is partly because the exact time of fertilization is not always known. Besides, a birth, of course, is not an appointment to date. The final date of birth depends on many factors. Most children are born + - 2 weeks after the calculated date of birth.
The course of pregnancy is usually in trimester (or trimester). Each trimester comprises three months of pregnancy, which are subdivided into weeks of pregnancy (SSW). Of course, such a classification is arbitrary, but helps a lot to clarify when something happens during development.
First trimester (months 1, 2 and 3, SSW 1-12)
Second trimester (months 4, 5 and 6; SSW 13-28)
Third trimester (months 7, 8 and 9; SSW. 29-40)
Note: All information is for scholastic documentation only and can not replace a medical diagnosis! Pregnancies are individual, so if you have any questions, ask your doctor.

Expiration of pregnancy

Blastogenese (Weeks 0 - 2): Zygote Morula blastocyst
Emryogenese (Weeks 2 - 8): embryo
Fetogenese (Weeks 8 - 45): Fttus

MonatsьbersichtWhat happens?
1 month
(SSW 1-4)
Fertilization of the egg cell takes place in the fallopian tube, creating the zygote. On the way to a womb the zygote divides and develops to a blastocyst. The implantation (nidation) in the uterine lining begins between day 6 and 10 after fertilization. The body starts delivering hCG (Human Chorionic Gonadotropin), an important pregnancy hormone.
2 months
(SSW 5-8)
The heartbeat of the embryo is measurable. The development of the brain, eyes and ears begins. The umbilical cord connects the embryo to the placenta, through which an exchange of nutrients and metabolic end products can take place. The central nervous system develops. At the end of the second month the embryo reaches a height of approx. 1.2 cm.
3 month
(SSW 9-12)
The head grows disproportionately to the body. Fingers and hands are recognizable. The later organs were created. The embryo is now a fetus. The increased movements of the fetus are not yet perceptible. At the end of the third month the size is between 4 and 6 cm.
4 month
(SSW 13-16)
All later organs have already been created and start maturing. The digestive system begins to work for the first time: the fetus swallows amniotic fluid and excretes urine. With a bit of luck, the first movements can be noticed at the end of the month. The Fttus is now 10cm tall.
5th month
(SSW 17-20)
The training of the genitals is done, which is why the sex can be determined by ultrasound. The skeletal system slowly hardens. So-called grease protects now the skin of the child. The growth is now fast. By the end of the month the farm is already 15cm tall.
6th month
(SSW 21-24)
The development of the brain is progressing and many new nerve cells are forming. The sensory systems are beginning to work. The embryo can hear and even distinguish the mother's voice from other voices. Meanwhile, the maturation of the organs continues. By the end of the 24th week of pregnancy, the child is already between 20 and 25cm tall.
7th month
(SSW 25-28)
The gate opens its eyes and can distinguish between light and dark. The maturation of the lung is almost complete. Now the Ftus begins to accumulate more fat, which is why its weight, at a size of 30cm, exceeds the 1kg limit.
8 months
(SSW 29-32)
Maturation of the genitals is completed so that the gender can now be clearly identified. A day-night rhythm at the fetus is detectable (active and inactive phases), in the REM sleep phases it may even come to dreams. Furthermore, increased fat storage for better regulation of body temperature. As a result, the 40cm-tall fetus increases in weight (about 2kg).
9th month
(SSW 33-36)
Completion of the Federal Development. The space in the womb becomes increasingly narrower for the fetus, so a full turn is soon no longer possible. The farm turns into a favorable position for the soon-to-be-born birth. About the umbilical cord important antibodies of mother reach the fetus which are necessary for development of immune system. The Lanugo hair disappears, however. The fetch now reacts clearly to external stimuli such as sounds and light. First labor pains occur. The fetus now weighs between 2.5 and 3kg., With a size of 45 to 50cm.
10th month
(SSW 37-40)
The growth of size in the uterus is almost complete. The fetus is now only gaining weight (birth weight about 3-4 kg). Only a very small percentage of the fetuses remain in the uterus of the mother during the 41st and 42nd weeks of pregnancy.