CHICAGO (AP) - The nation's most influential pediatrician's group says research shows that parents' sexual orientation has no effect on a child's development and that kids fare just as well in financially and emotionally stable straight or same-sex families.

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The American Academy of Pediatrics endorsement of same-sex marriage has been published online, citing the belief that a two-parent marriage is best equipped to provide the right environment. Their policy says that if a child has two same-sex parents who choose to marry, it's in everyone's best interests for "legal and social institutions allow and support them."

The policy cites reports indicating that almost 2 million U.S. children are being raised by same-sex parents.

Officials with the group said they wanted to make the academy's views known before two same-sex marriage cases are considered by the U.S. Supreme Court next week.