Sternal clefts are infrequent congenital malformations, particularly in their complete presentation. There are less than 100 descriptions of these defects published in the literature worldwide. We report a clinical case of lower sternal cleft associated with congenital laparoschisis in a 2-year-old boy. Surgery was performed because of recurrent pneumopathy and the risk of cardiorespiratory decompensation in the midterm. A semi-resorbable prosthesis was used for sternal closure. We have not observed any complications with this sternal closure system in our patient. This approach is easy, safe, effective and not harmful to a child's growth.