The American Academy of Pediatrics declared its support for same-sex marriage for the first time on Thursday, saying that allowing gay and lesbian parents to marry if they so choose is in the best interests of their children.

The academy’s new policy statement says same-sex marriage helps guarantee rights, benefits and long-term security for children, while acknowledging that it does not now ensure access to federal benefits. When marriage is not an option, the academy said, children should not be deprived of foster care or adoption by single parents or couples, whatever their sexual orientation.

The academy’s review of scientific literature began more than four years ago, and the result is a 10-page report with 60 citations.

“If the studies are different in their design and sample but the results continue to be similar, that gives scientists and consumers more faith in the result,” said Dr. Ellen Perrin, a co-author of the new policy and a professor of pediatrics at Tufts University School of Medicine.