Re: And it's only taken 52 years.
More likely to do with "statistics". Like the great helmet controversy of WW1 where the introduction of the battle bowler lead to an INCREASE in head injuries. (Because instead of soldier being killed by clods of earth raining down on them in an artillery strike they merely received non fatal head wounds).
In this case improved in-utero diagnostics, increased knowledge about care for premature infants and better ways of keeping a child alive means doctors are sooner going to decide to allow the child to be born early, where they would have let is stay in the womb before. Thus an increase in premature babies. (Instead of a whole lot of near full term stillborn babies that might have survived by being delivered premature nowadays)