Stories like this one
have been around for so long
that ten years ago [!]
the government (ours)
issued a briefing on it.
Maybe it's not "myth" --
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The "Baby Parts" Myth: The Anatomy of a Rumor United States Information Agency, May 1996
... Conclusion
Despite the fact that it is totally unfounded, the "baby parts" rumor is now perceived as fact and accepted as conventional wisdom in large parts of the world. It has generated hysteria in Central American countries, led to brutal, unprovoked attacks on Americans and others, disrupted the lives of numerous prospective adoptive parents and the children they wished to adopt, won prestigious media awards in Europe, caused major disruptions in cornea donations in Latin America, and is, in all likelihood, causing numerous premature deaths because of its adverse effects on organ donation.
This sensationalistic rumor springs from deep, irrational, but very powerful anxieties stirred by advances in the life-saving process of organ transplantation. These fears have unfortunately been fanned by some who have cynically advanced this rumor for political purposes. The false rumor has also been propagated by many others who genuinely believe it. As a result of this cycle of events, the “baby parts” myth has now attained such widespread currency that it continues to feed on itself and, tragically, is widely believed despite numerous corrective statements, authoritative statements pointing to the impossibility of such practices occurring, and the fact that despite almost ten years of searching, no government, non-governmental organization, intergovernmental body, or investigative journalist has ever produced any credible evidence to support the charges.