To precisely determine the term of the birth of the child rather difficult as it is difficult to establish the correct term of an ovulation and date of fertilization. Pregnancy on average continues 280 days (40 weeks). Definition of date of childbirth is based on the assumption that the pregnant woman had a 28-day menstrual cycle, and the ovulation occurred for 14–15 day of a cycle.
It is required to you
- - calendar.
Instruction
1. The first way of determination of term of childbirth - a formula Negle. To date of the first day of the last periods it is necessary to add nine months and seven days. Simple method of these calculations: of the first day of the last monthly count three months ago and add seven days.
2. It is possible to define date of childbirth, having counted of the first day of the last menstrual cycle of 40 weeks.
3. One more way: to add by estimated day of conception 268 days.
4. The most exact method of determination of term of pregnancy - ultrasonography (ultrasonography) in early pregnancy. Having undergone ultrasonography up to 12 weeks of pregnancy, it is possible to learn date of conception to within several days, and, proceeding from it, to calculate approximate date of childbirth. In the second and third trimester the probability of an error of determination of term of childbirth increases, it is proved by features of development of a fruit.
5. It is possible to determine pregnancy term at bimanualny inspection. The gynecologist can establish pregnancy term at measurement of the size of a uterus — determination of level or height of standing of a bottom of a uterus, a stomach circle. On the term of 4 weeks of pregnancy a uterus the size approximately about egg, in 8 weeks — about goose egg. In 12 weeks the uterus increases to the sizes of a male fist, the bottom of a uterus reaches the upper edge of a pubic bone. In 16 weeks of pregnancy a uterus bottom on the middle of distance between a bosom and a navel, and in 24 weeks it is at the level of a navel. The uterus gets the biggest size in 36 weeks (the circle of a stomach reaches 90 cm), to this term the bottom of a uterus rises to edges, and then by 40 weeks falls by couple of centimeters. Lowering of a uterus means that the kid already gets ready for childbirth.
6. Also estimated date of childbirth is defined to the first stir of a fruit. At primipara women it occurs usually on the 20th week, and at povtornorodyashchy from 18th week of pregnancy.