Although of most importance for pediatricians and pediatric surgeons, the inguinal region of male newborns has never been steadily studied in a morphometric view. Our investigation was performed in order to measure the diameters of the inguinal rings (internal and external) and to determine their exact relative position. We used 30 fixed bodies of Brazilian male newborns, chosen randomly, from the Laboratories of Anatomy of the Faculty of Medical Sciences of Santos and UNIFESP - EPM. The dissection of the inguinal region was carried out in a classical way and the diameters of the inguinal rings were taken and their relative position observed. Our data confirmed that exact superposition of inguinal rings is quite rare in male newborns, the majority of them having a wellformed inguinal canal at birth. The diameters of both inguinal rings show no significant differences in size (one to another) nor in comparison to both sides of the body