PERIOD OF PREGNANCY

Period of pregnancy and childbirths
PERIOD OF PREGNANCY AND CHILDBIRTHS. Pregnancy in woman on the average continues 280 days, i.e. 40 weeks, or 10 obstetrical months. Frequently the duration of pregnancy exceeds 280 days; there is the generation of mature children with the pregnancy, which was being continued are less this period (230-240 days). For the more precision determination of the period of pregnancy and childbirths it is necessary: 1) to take pregnant women to the calculation within the earliest periods of pregnancy and to inspect their 1-2 times per month; 2) to consider anamnestic data in conjunction with the objective inspection.For enumerating the period of the kinds to the first day of last menses are added 280 days, i.e. 10 obstetrical or 9 calendar months even 7 days. Usually calculation is produced more simply: from the date of the first day of last menses they count off back 3 calendar months and add 7 days. For example, if last menses began on December 11, then, after counting off 3 mo. back (on November 11, 11 October 11 September) and after adding 7 days, they determine that the period of kinds on September 18. With the determination of the period of pregnancy and childbirths is considered the time of first [sheveleniya] of the fruit: in [pervoberemennykh] this occurs in 20 weeks, in – into 18. To the date of first ] of fruit are added 5 obstetrical months (20 weeks) in  and 5V2 of obstetrical months (22 weeks) in .
of fruit – subjective sign, which is considered as auxiliary. For determining the period of pregnancy the great significance data of the objective of the study have: value and the form of womb, the volume of stomach, the length of fruit, the dimensions of its head. In first 3 mo. of pregnancy the period is determined in the value of womb, after 4 mo. – on the height of the standing of the bottom of womb; the volume of stomach and the dimensions of intrauterine fruit more lately are measured.