Unlike squeakers, which are unintuitive for babies to use without assistance, the sound the rattle makes when babies hold or move it stimulates action-reaction learning, providing babies & toddlers with an instant reward & helping them understand cause & effect.
Poppy likes going to her local market, staying home, and eating roast beef (she despises when there is none). But it's her French language skills that has Poppy saying, 'oui, oui, oui, oui' all the home and into the arms of a loving child.