Changes made easy (even mid-wriggle). Meet The Billie Short Sleeve Zip Romper, a relaxed baby romper with a zip-through design for quick changes. Made with lightweight cotton with a relaxed feel, it's soft on delicate skin and gives them room to move. The short sleeves and legs keep them cool during tummy time, pram rides, and all the in-between moments. Made for daytime cuddles and middle-of-the-night feeds.