Start your little Trekkers out young with these Star Trek onsies from ThinkGeek. These are short-sleeved onsies with snap bottom closures. Sizes available are 6 months, 12 months, 18 months, or 24 months. The Star Trek Uniform Creepers are available in Command (gold), Science (blue), Engineering (red), and Cadet (gray). Normal price is $15.99, but they are on sale now for $12.99.