A pediatric spinal immobilization device and method for immobilizing a pediatric trauma patient are provided. The immobilization device in one embodiment is releasably secured to an adult-sized backboard, and in another embodiment is provided with a removably contained infant-sized backboard. The immobilization device provides body-straps mounted along a central section of the device, and individual appendage-restraints to permit removal of the body-straps without compromising control over the appendages of the injured patient. Compressible, crescent-shaped headblocks are tightly yet removably fastened to the immobilization device. A harness of the immobilization device helps secures the injured patient over an included adjustable elevation device and when used in conjunction with the headblocks, significantly reduces the risk of further injury from lateral and flexion movement of the head.