How to calculate monthly pregnancy
"How many months do you?" - A question posed by eager relatives and friends are often baffled by the future mother. After a period of prenatal obstetric taken place in weeks. Maybe you and will be very convenient to observe the baby's development process, counting months, as we did our mothers and grandmothers.
Instruction how to count pregnancy by month
First you need to figure out what the starting point means the beginning of pregnancy. Conception usually occurs in the middle of the cycle, for 14-16 days after the onset of menstruation. About the delay can be found in 2-3 weeks, and the logic of this period should correspond to two or three weeks of pregnancy, or half of the first month. And the expectant mother, coming to the antenatal clinic with a week of delay, often dumbfounded term that tells her gynecologist: 5 weeks.
The fact that doctors in antenatal clinics and maternity hospitals more than convenient different scheme. It is not known when your ovary from the egg out, and there was a conception. In some women, fertilization can occur not on the 14th day, and in the first days after menstruation or at the 17-20 day cycle. Not every woman can call a number in which there was unprotected sexual intercourse.
Therefore, gynecologists all over the world consider the beginning of pregnancy from the first day of the last menstrual period. Thus, the gestation period of 280 days, or 40 weeks.
With regard to the calculation of pregnancy for months, due to the addition of the term obstetric 2 extra weeks, it turns out that the first "month" of pregnancy is the most mysterious, because it consists of 6 weeks! Subsequent months are common calendar: 7-11 weeks - 2nd month 12-15 weeks - the third month, weeks 16-19 - the fourth month, weeks 20-24 - the fifth month, weeks 25-28 - the sixth month, 28- 31 weeks - the seventh month, weeks 32-35 - the eighth month, 36-40 weeks -devyaty month.
And still more correct to consider the duration of pregnancy in obstetric weeks - and confusion less and will be more convenient to follow the growth of the baby. After all, for mothers magazines, medical sources and exchange cards have long been used internationally accepted settlement scheme.