Background The management of giant omphaloceles (GO) can be quite difficult when there is absence of abdominal domain. Coverage with delayed closure has been described. We present a technique to create an adequate peritoneal domain. Methods This is a retrospective review of our experience using an intraperitoneal tissue expander (IPTE) to create adequate abdominal domain in 2 patients with GO. Results In 2 children with unrepaired GO, an IPTE was placed into the pelvis and was inflated to the target volume over 3 to 4 weeks. At the definitive operation for the closure of the abdominal defect, the IPTE was removed, allowing reduction of all the viscera into the peritoneal cavity and achieving complete abdominal wall closure. The patients are now 1 year postoperative, each having a normal abdomen and enjoying normal growth and development. Conclusion Intraperitoneal tissue expander placement can create the needed domain over several weeks in GO. Its use in 2 cases was associated with satisfactory complete abdominal wall closure in short order. This technique should be considered as a treatment option.