Girls, has anyone encountered this? Maybe someone among acquaintances …

Girls, has anyone encountered this? Maybe someone among acquaintances had premature babies, what are the consequences? How do these children feel now, how are they developing? Yesterday my sister was urgently cesarean sectioned, although the due date is in December, they put a bunch of scary diagnoses on the child, up to Down syndrome and heart defect, waiting for the results of the analysis for confirmation or refutation.