Of the sort:
breastfeeding necklaces (like this) give baby learning opportunities and stop them from getting brain damaged

lack of ''tummy time'' is to blame for all sorts of things from cognitive development to ability to read. I mean, really? We are damaging our children for life if they don't spend 10mins a day on their bellies?
And tons of others, including my old favorite, the BLW fad where babies practice their fine motor skills, jaw muscle movement and coordinating swallowing, which is helpful because otherwise they would never get a chance to do these things with purees and finger food.
All of these ^ things are good ideas, so why don't they just stop at that. Why do they have to tack on life-altering, super-duper brain development shit to sell the idea?