MADRID .- (AGENCIALAVOZ.ORG) If you mean 40 weeks? One of the first things you learn when a woman is pregnant is to tell the time in the calendar for weeks. So soon discovers that pregnancy lasts more than you ever thought almost 10 months. So why do they call it nine months?
Dr. Antonio González, head of the area The Hospital Universitario La Paz, Madrid, says the key to these 'accounts of the old' which can confuse more than one: "The length of pregnancy varies depending on if you count from the date of the last rule, either the last ovulation. "
The trick, he says, is that most women know exactly when you last menstruated, while it is impossible to know when ovulation occurred (unless the pregnancy is the result of a single sex. ") Therefore, conventionally, "in the query add 280 days from the date of the last rule to calculate the date of delivery." Ie 40 weeks. If you were
one of those women who can accurately calculate your ovulation (usually around 14 days after the rule), "real time that passes the fetus in the womb from conception to birth is 266 days (equivalent to nine months of pregnancy have been attributed to life). That is, 38 weeks.
As clarifies the gynecologist Madrid, due to these accounts, it is considered that the pregnancy has come to an end when the woman has completed between 37 and 42 weeks of pregnancy. Below, a pregnancy is considered preterm, while 42 weeks ago talking about a prolonged pregnancy and in many schools choose to induce labor to avoid risks to the mother and baby. "After that limit, the placenta, which is the lung of the fetus, age, and that can cause respiratory problems and feeding."
Despite the progress, science, social changes have occurred, the 266 days remain an immutable biological measure, says Gonzalez. "The only difference is that once spoke of lunar months to calculate the output of bills and now we have turned to weeks and days, but between 70% -80% of women meet the 280 days after your last period" .
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