One trend in surgery is the transition from open procedures to minimally invasive interventions. The availability of a system for the pre-operative planning of a laparoscopic procedure can be of great help to the surgeon. This support is even more important in infantile laparoscopic surgery where is needed a good understanding of the exact conditions in which the patient’s organs are and the precise location of the operational site. The developed application allows the surgeon to gather information about the patient and her/his pathology, visualizing and interacting with the 3D models of the organs built from the patient’s medical images, measuring the dimensions of the organs and deciding the best insertion points of the trocars in the patient’s body. This choice can be visualized on the real patient using the Augmented Reality technology.