Infants that had *delayed* clamping (longer placental transfusion) had greater myelin. Early clamping, ths tandard practice, lower.>>13432430
All of the reasons are retroactive and ad hoc. Virginia Apgar thought it was "cleaner" (or something) and the design of her Apgar scoring system encouraged clamping early, thus, hospitals starting doing it to report better neonatal health scores. The irony.
They claim it's to prevent neonatal jaundice and maternal hemmorhage, however no association has been reliably found, nor was it found at the time the practice started. What was known however, is the type of vitamin K shots they used to give occasionally caused jaundice, as can delayed breastfeeding (not receiving the colostrum, therefore the gut isn't flushed of debris and does not seal up).
Impairing a population would be done as part of a gradual process of infiltration and subversion (leading to totalitarianism), or it would facilitate something liek Brave New World. there are many reasons and potential advantages, just look at the Soviet purges. Millions exterminated, and after the fact they were like "shit we could use some of them right about now..." But, overall, killing or crippling them was a net benefit. The aprts harvested off the infants are sold as well. Several reasons, too much to describe.