Looking for Info on Elizabeth of York's Pregnancies

A while back I read something on the internet on Elizabeth of York's children: namely that the oft-included Edward in her list of progeny might have been a shortlived child born either early in the marriage 1487/88 (between Arthur and Margaret) or in the gap between Elizabeth and Mary.

However, I can't seem to find the site where I read it. Does/can anyone help here? Especially since they had a couple of theories why EDWARD TUDOR and EDMUND TUDOR, duke of Somerset aren't the same kid.

Over to you...
 
Thought it might be on genealogy.euweb.cz but the site is currently down.
It uses a combination of sources on genealogy and appears fairly accurate.
 
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