The aim of the study is to make retrospective analysis of 9 years experience in the feeding of praematuries and high risk newborn in that ward in First City Hospital-Sofia with formula milks "Nenatal" and "Nutrilon-premium". 721--42.4% from all babies in this period were feed with those formulas. With Nenatal only--11.8%, with Nutrilon-premium 88.2%. This the fact is due that all babies under 2000 gr. were fed with Nenatal, and after reaching 2000 gr.--with Nutrilon-premium. The results confirm that Nenatal is right formula for feeding of low and very low birth weight infant, due to its special content and qualities. The results from Nutrilon-premium illustrated that mean gain weight is the biggest in I grade of prematurity--33 grams, followed by matures--30 gr, after them II grade--29 gr., III grade--27 gr., IV grade--26 gr. As a conclusion we may say that mean gain weight for all groups is 29 grams. Consuming all gain weight of the babies feeding with Nutrilon-premium data appear that the biggest is in III of prematurity--1499 grams, followed by IV grade--1418 gr., I grade--1341 spama, II grade--1219 gr., and last matures--745 gr.