Chunky Knit Jumper Baby Pink Little and Fern Luxury Speckled Neutral Chunky Baby Jumper Billy Knit Jumper Olive Peach The Label Nature Baby Billy Jumper Marine Blue Stripe Shorties Childrens Store Billy Knit Jumper Berry Peach The Label. The Billy Jumper is a classic, easywearing sweater style that will keep little one comfortable all year round. Knitted in a chunky certified organic cotton yarn, this jumper is durable and easy to care for. * GOTS Certified * 100% organic cotton * chunky tuck knit stitch * knitted rib cuffs and hem