Yeah Baby Goods Inflatable Cushion Insert
$6.99

Inflatable cushion insert that goes inside the Yeah Baby Goods cushion covers (not needed if you already have a support cushion from IKEA). Designed to adjust as your baby grows. Fill the cushion all the way when your baby is little, then gradually let out air as needed to keep a comfortable fit.

Please note, you only need one cushion insert per highchair, then you can change the cover as much as you want.

BPA free