In a recent study it has been reported that pregnancies with less than 36 months gap leads to a higher risk of autism in the second sibling.
The study involved more than 600,000 second children born in California between 1992 to 2002.
Keely Cheslack-Postava and colleagues at Columbia University in New York City pointed out that mothers with pregnancies less than a year apart were under a higher risk, reports English.News.Cn.
However, researchers added that additional studies should to be done before confirming the findings.
The report was published in the journal Pediatrics.