Now pregnant women will last 10 months.
Pregnancy normally can last for 10 months, not nine, as is commonly believed now. To such conclusion the American scientists from the University of North Carolina, to observe for 125 pregnant women.
It turned out that one woman out of 20 give birth in time – 280 days, or 40 weeks after conception. Most expectant mothers the same length of gestation varies from 37 to 42 weeks. Within 10 days after giving birth to the date set for 70% of pregnant women. “Norms of childbearing should be reconsidered” – experts believe the National Institute of Health Sciences in Durham.
Pregnant women can not last 9 months, one month and more or less and it may become the norm. Moreover, this term “norm” is directly dependent on how quickly the embryo can not attach to the uterine wall. And in cases where increased levels of progesterone – one of the signs of the ensuing pregnancy – occurred later, duration of pregnancy was reduced by an average of 12 days.
In other words, what happens in a woman’s body in the very early stages of pregnancy lays the date of birth of the child. Scientists have also identified several factors that influence the duration of the pregnancy. For example, the older a woman is, the longer it may be pregnant – an average of one day per year increase to the deadline, Komsomolskaya Pravda in Ukraine.
Also the date of birth is associated with weight woman at her birth – the excess of the norm of 100 grams adds one additional day during pregnancy. Having a baby can also be delayed if a previous pregnancy lasted for more than 38 weeks. The average duration from ovulation to birth is 38 weeks and two days, the researchers found during the study. Once removed from the results of six cases of premature birth, experts have concluded that the timing of births as different by 37 days.
Scientists from the city of Bamberg, spending a study that from 1993 to 2007 was attended by over 42 thousand working women have come to the conclusion that pregnancy can be “infected” by looking at someone else’s example.