Whether the Guardians of the Galaxy: Cosmic Rewind ride at EPCOT is "OK" for your child depends on their height and their tolerance for high-speed, rotating motion. The ride has a strict 42-inch (107 cm) height requirement, which most children reach between the ages of 5 and 7. Unlike traditional "scary" coasters, it does not feature any inversions (going upside down) or massive vertical drops. However, it is an exceptionally intense "Omnicoaster" that features a backward launch and ride vehicles that rotate 360 degrees while traveling at high speeds through the dark. This can be very disorienting and is a frequent trigger for motion sickness, even in children who enjoy other coasters like Big Thunder Mountain. If your child is a fan of the Guardians movies and enjoys thrills, they will likely love the immersive music and storytelling. However, if they are prone to queasiness or are afraid of the dark and loud noises, you might want to utilize the "Rider Switch" service, allowing one parent to ride while the other waits with the child, and then swap without waiting in the full line again.