“…On the one hand, the main ones have been length of hospital stay, [36,38,43,44,46] transition time from tube feeding to independent feeding, [36,38,39,43,44,46] sucking skills, [37,40,42,45] oral feeding skills, [37,39,42,44] motor function [38,43] and growth [37,38,43]. On the other hand, some of them considered assessing the influence on breastfeeding skills, [46] infants' alertness [37] and their physiological constants [37].…”