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CHICAGO (AP) — The nation's most influential pediatrician's group has endorsed gay marriage, saying a stable relationship between parents regardless of sexual orientation contributes to a child's health and well-being.

The American Academy of Pediatrics' new policy, published online Thursday, cites research showing that the parents' sexual orientation has no effect on a child's development. Kids fare just as well in gay or straight families when they are nurturing and financially and emotionally stable, the academy says.

The academy believes that a two-parent marriage is best equipped to provide that kind of environment. Their policy says that if a child has two gay parents who choose to marry, "it is in the best interests of their children that legal and social institutions allow and support them to do so."

The policy cites reports indicating that almost 2 million U.S. children are being raised by gay parents, many of them in states that don't allow gays to marry.

The academy announced its position Thursday. Officials with the group said they wanted to make the academy's views known before two gay marriage cases are considered by the U.S. Supreme Court next week.

"We wanted that policy statement available for the justices to review," said Dr. Thomas McInerney, the academy's president and a pediatrician in Rochester, N.Y.

The pediatricians' stance is not surprising. They previously joined other national groups including the American Medical Association in supporting one of the Supreme Court cases, which contends the Defense of Marriage Act is unconstitutional. The academy also previously supported adoption by gay parents.

The academy's statement notes that several other national health groups have supported gay marriage. Those are the American Academy of Family Physicians, the American Psychiatric Association, the American Psychological Association and the American College of Nursing.

Dr. Ben Siegel, a Boston pediatrician and chairman of an academy committee that developed the new policy, said its focus is on "nurturing children. We want what's best for children."

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