In the present study, the anthropometric measurement was made by the nursing team, being subject to error, which was a limitation. In addition, the retrospective nature of the study was another limitation, since the proportion of each type of milk offered during hospitalization for the included patients was not known. It is important to note that even patients who had a complete transition to artificial feeding also received human milk for some period during hospitalization. Therefore, we could not be sure that the group that was exclusively breastfed at the time of discharge received a greater proportion of human milk during hospitalization than the other groups.