I question the claim of "most or those children or their mothers . . ." because I do not believe there is any case studies to back that.
Look, I founded and ran a Food Bank for over 26 years, and I know the best thing for infants is their own mother's breast milk. I know a lot about nutrition. I would have heard about such a problem if it were a major issue. I've been out of that field for over 15 years, but I still don't see it.
They just stopped taking the supplements, and didn't use the formula. The WIC people insisted there was nothing wrong with either. When they quit using the supplements and changed formula the problem quit.
No one did a study, partly because no one would admit there might be a problem.
So, no, you won't read the study anywhere, and there is no link to post.
I'm a great-grandfather, and between grandkids and family friends someone is always bringing a new baby by for my wife and I to coo over. Any given day, between family and friends, there is a baby on the way or just out.
It may be by virtue of different genetic groups, a different lot of formula/vitamins, or different base diets, but these people were adversely affected while the group you dealt with was not. There appear to have been no lasting ill effects.
No argument, BTW on mom's milk. They all seem to do well on that.