When my first was about  6 weeks old he had some blood in his stools.
The doctor said it might be from a tight anal sphincter and inserted a
finger.  My son looked very surprised, cried out, there was yet another
gush of feces from this baby who stooled with every diaper, and I never saw
blood again.

I know, looking back, that my son was a victim of over-active let-down
that I learned to manage under his fierce tutelage (he would simply scream
if I took him off one side in order to give the other). And he was
subjected to lots of dairy prenatally and has never liked milk.  So there
are several diet-related reasons that he might have had bloody stools, and
I might have been correcting them around the time of his "rectal invasion".
Then again, who knows.

This is not a defense of daily dilations, just a thought to add to the
"discussion".

Diane Wiessinger, MS, IBCLC, LLLL  Ithaca, NY