Table 1.Characteristics of the mothers and comorbidities of the newborns according to type of feeding at discharge.Group 1Group 2Group 3 Comorbidities BPDYes6 (3.11)128 (66.32)59 (30.57)PIVHGrade 1 and 29 (6.72)66 (49.25)59 (44.03)Grade 3 and 43 (5.77)34 (65.38)15 (28.85)Apgar score≤52 (5.56)23 (63.89)11 (30.56)>564 (10.56)231 (38.12)311 (51.32)SNAPPE<2056 (13.18)140 (32.94)229 (53.88)≥2010 (4.65)117 (54.42)88 (40.93)GenderMale32 (9.28)143 (41.45)170 (49.28)Female33 (10.96)115 (38.21)153 (50.83)Late onset sepsisYes12 (4.41)148 (54.41)112 (41.18)Necrotizing enterocolitisYes2 (3.77)30 (56.60)21 (39.63) Maternal characteristics Age<20 years7 (5.69)56 (45.53)60 (48.78)≥20 years58 (11.09)201 (38.43)264 (50.48)Schooling<10 years15 (6.85)96 (43.84)108 (49.32)>10 years50 (12.38)149 (36.88)205 (50.74)ChorioamnionitisYes3 (3.39)30 (50.85)27 (45.76)Antenatal steroidNo18 (7.03)111 (43.36)127 (49.61)DeliveryVaginal21 (9.86)94 (44.13)98 (46.01)Cesarean45 (10.37)163 (37.56)226 (52.07)Data are reported as numbers (%). Study groups: 1, exclusive breast milk; 2, mixed feeding; 3: exclusive artificial formula. BPD: bronchopulmonary dysplasia; PIVH: periintraventricular hemorrhage; SNAPPE-II (Score for Neonatal Acute Physiology with Perinatal extension-II).