You can use Universal's "child switch" when you ride the Forbidden Journey.
Universal offers an awesome child work program. According to their site, here's how it works: "If any child in your party cannot ride an attraction, one or two adults can wait with the child in the attraction’s Child Switch room. When the rest of your party returns, they switch with those who were waiting with the child, without having to wait in line again." This basically means more riding through an adventure with Harry Potter and friends, and less waiting!