Ampulla of Vater
Illuminator
That may be the case however the fetus exited the uterus within just a few hours of it being washed up. There were no indications of feeding from other marine scavengers. That is very very odd.
Biological material the proceeded the coffin birth would have attracted dozens of scavengers of all shapes and sizes and the fact that it even made it to the shore were 100-to 1 or a thousand to one.
Dr Henry Lee speculated that garbage might have covered the fetus on it's way to the shore, however, he also noted that was a thousand to one as well.
I don't know anything about the marine life in the bay however it would have been consumed quickly in any fresh water lake in the south.
Nothing about the skeletal remains were noted as far as the bone sizes by either report so I would guess that was rumor.
It is also problematic that all of the searchers down with penetrating radar did not pick up the body masses until after they washed up.
What is your source for the highlighted statement?