Typically, movement of the fetus in women during the period from 18 to 21 weeks of pregnancy. Rarely, but it happens when it happens and 14, and even at 25 weeks. In fact, the first stirring of the baby in the womb depends on the individual characteristics of the woman's body.
Women are more dense physique is much harder to recognize the quickening than those that have slim figure. In addition, those with a first pregnancy, I don't know what are the feelings during intrauterine movement of the child, why can not immediately see this fact. But women who had given birth, it is able to feel earlier perturbations. The first movement of the fetus also depends on the thickness and sensitivity of the walls of the uterus.
In any case, knowing the date of the first fetal movements, you can determine the approximate date of upcoming birth. For this to number, when was the first fetal movement, add 20 weeks, that is half of the period the entire pregnancy. This is only if you primipara woman, if powernotes - add 22 weeks. Received date and the probable date of birth.
Please note that you can't believe the results of this calculation, because of the subjectivity of perception of the first fetal fetal movements. Some women may fail to take regular bowel movements for the first movement of the baby.
More accurate delivery date can be set only watching the pregnancy by a qualified gynecologist. He defines it, based not only on the date of the first perturbation, but also on the date of the last menstrual period, date of conception, the uterus size, the results of the analysis of blood on hgch, as well as the results of ultrasonography (us). As a rule, the latter figure gives a more accurate data.