Ducky Kint Romper. The knit romper features an adorable yellow ducky embroidered on the center front, yellow ribbed trim on the neckline, sleeve and leg openings, and a 3 snap closure, making diaper changes quick and convenient. Made of 100% cotton knit, the Ducky Knit Romper is available in two sizes: 0-6 months and 6-12 months.