Women who conceive again within 12 months from the previous pregnancy have a three times higher risk of giving birth to a child with autism. This is shown by a study published in Pediatrics by researchers at Columbia University, however, minimize the warning: "This is a statistic that adds to the board to wait at least a year between pregnancies and the other for avoid other known risks such as preterm birth and low birth weight. " The study includes about 663mila children born in California between 1992 and 2002 . Children born within 12 months after the birth of a sibling are at greater risk 3.4 times higher than their peers. The risk decreases as you move the time of the second pregnancy: 1 to 2 years is 1.9 times greater, while if the interval exceeds 2 years the risk rises to 1.2 times. causes the onset of autism is still unclear. The hypothesis is that a combination of genetic and environmental factors. The American study on pregnancies close together not say more, but emphasizes that there is another risk factor related to the biological time of pregnancy. For example, the possible lack of sufficient nutrients. Among the possible failures suffered by the fetus, for example, there are inadequate levels of folic acid, iron and fatty acids that may limit polinsanturi embryonic development before and after fetal.
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