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I don't think you're going to find it. The AAP has never taken a strong stance against retraction, only mildly against what they term "forcible retraction". It was an improvement when the AAP first acknowledged that the foreskin adheres to the glans and generally does so for several years; before that it was like they were trying to deny even this anatomical fact. When faced with the reality that the first step in an infant circumcision is to run a probe under the foreskin to lyse the natural adhesions, they relented. Thanks, YouTube! Before that, parents had no idea and docs wanted to keep it that way.
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The position of most American physicians can be summed up in an anecdote that a good friend of mine, a PhD in medical history and longtime intactivist, related a while back. He had been asked to address a conference about the anatomy and care of the foreskin, and he explained that only the outside should be washed and no attempts made to retract the foreskin. A young male doctor near the front row couldn't help blurting out, "But... but... that's completely counterintuitive! You have to wash everything! How are you supposed to see the glans?" By the end of the conference this MD (who mentioned he was circumcised) had been educated and convinced, but his gut reaction pretty much extends to much of the US medical profession. After 100 years of routine circumcision, American parents are conditioned to expect to see a head on the end of the penis and doctors can't really visualize what sort of postpartum development is taking place as the synechia breaks down on its own.
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As we all know, nature did a superb job of designing the genitals and part of this remarkable, highly evolved design is that the penis generally does really well through childhood when left alone. There are years of nerve ending and mucosa development still going on which circumcision dramatically interferes with, and the organ is largely self-cleaning from the inside out. Even the dartos muscle with the foreskin develops differently if a boy is routinely retracted. But the urge to "do something" is still very great in our society. It's a mixture of curiosity, misplaced good intentions, and lack of understanding.
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As a final note, never underestimate the fear of litigation. If the AAP were to come out specifically against retraction, their members could be sued left and right for failure to follow standard of care. They'd rather leave it up to each MD. Parents, be informed and be vigilant!