| Characteristics | Range or percentage (n) |
| Gestational age | 37 - 41 sem |
| Birth weight | 2190 - 3920 gr |
| Breastfeeding | 71% (47) |
| Breast and formula feeding | 19.6% (13) |
| formula feed | 9% ( 6) |
| Caucasian race | 74.2% (49) |
| Others races | 25.6% (17) |
| Blood group incompatibility | 13.6% (9) |
| Cephalohematoma | 3% (2) |
| Clavicle fracture | 3% (2) |
| Apgar score at birth <7 | 1.5% (1) |