What the website says:
Introducing the first infant support for baby swings, exersaucers, jumpers...even infant playground swings! This soft, thickly-padded wraparound prevents babies from slumping and slouching in all types of enclosed seats, encouraging good posture and core strength from the start. No more one-size-fits-all baby seats! Size adjustable; grows with baby, thanks to three sets of crotch snaps and Velcro® side straps. For ages 4 months and up. Machine wash. Imported.