You really get two crochet baby hat patterns in one. The more complex, and therefore more interesting, is the intended "Earth in Space" design. You add a tiny bit of surface embroidery to the body of the hat to create the illusion of stars. Then you learn how to make an Earth-inspired pom to go atop the hat. However, if you leave off those two details, you're left with the simpler version - a continuous spiral crochet hat pattern that you can work in any color to suit any baby.

Pattern: Earth in Space Crochet Hat by Neschof