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Probably, even the younger schoolchildren in our country know that a woman has a baby nine months. However american scientists refuted this claim. Watching Pregnancy Carefully thousand patients, they concluded: the child is bearing an average of ten months.
For example, according to experts at the University of North Carolina, out of a hundred pregnant women, only three to four give birth, as said on time, that is, after nine months. But is it possible for should such a low percentage be considered the norm?
More than seventy percent of women in labor give birth to ten to fifteen days after the date that is set from using ultrasound. In this case, the duration of pregnancy is played many factors.
For example, the age of a woman in labor has a direct effect on gestational age: the older a woman – the longer she carries your child. Each year of her life extends the gestational age by one day. For example, if a woman at the age of 19 wore a child of forty weeks, at 39 years of age her pregnancy will last 20 days longer and will reach 42 weeks. True, for some reason this applies only to women in labor who have a first child for at least 38 weeks (until scientists explain this).
And even with what weight she appeared on the light herself woman in labor, affects the duration of her pregnancy – every hundred grams higher norms extend it for a day or two.
So it turns out, American scientists say, that generally accepted a period of nine months is very conditional, in fact it is very agile and more gravitated nevertheless to ten months.
