The child's birth - always a joyful event. But before it happens, there pass 9 months of the expectation not always interfaced to the pleasant moments. And while future mom struggles with toxicosis, the child is busy too.
Stages of pre-natal development
On average, pre-natal development lasts 40 weeks or 280 days. And normal the period of incubation is in an interval 38-42 weeks. The child considerably changes each of 9 months, but the main the period three: initial, germinal and fetal.
Initial stage
The shortest stage from called, lasts one week. But, nevertheless, future child actively develops. This period is complicated by lack of external manifestations of pregnancy. To a delay at the woman monthly, future mother can lead a life, adverse for her situation, - to accept alcohol, drugs forbidden potential mothers, to smoke, etc. Such mistakes are generally made by those women who do not plan pregnancy. If harmful effects at this stage are too intensive, then pregnancy just will not occur.
At safely taken place conception within 7 days there is a repeated division of the turned-out cage zygote. To third day it already turns into a cage-morulu. In 24 hours the cavity is published in the morul, transforming it to a blastocyst. All these transformations happen in uterine tubes. For the 5th day transformed in a lastotsist a germ leaves in a cavity of a uterus and process of implantation in a uterine mucous membrane begins. Successfully ended implantation marks the end of the initial stage.
Germinal period
Period, very responsible for development of the child. Formation of all bodies and systems happens within seven weeks, that is since a week of term, the 2nd on the 8th. On term in 3 weeks future child already has a kidney prototype, creation of heart and a blood system begins. By four weeks practically all vitals have the prototypes. Future brain in the form of nervous angliya, endocrine glands, lungs, a liver, a stomach and a pancreas. There is so-called primary kidney. There begin the origin hands and legs. On the 5th week, respiratory organs continue the development, the urinogenital system actively is under construction. During the period from the 6th to the 8th week at the child the face is formed, there are noticeable eyes and small ears. There are fingers. The head is more than body, occupies about a half from all length of a trunk, a component of 3 cm.
Fetal period
From ninth week and until the birth there is a further maturing of systems of an organism of the child. After 3 months of pregnancy the child who reached approximately nine-centimetric growth begins to move. The truth from the outside, for mother, these movements are still imperceptible. And only on reaching 16-20 weeks of term mother can feel the first pushes. In 28 weeks the formation of bodies and their systems approaches end, their functional maturing continues. So, approximately up to 40 weeks, the child grows and gains weight, preparing for process of the birth and almost independent life.