1) Gross motor: exciting ball-popping action and sounds encourages baby to push and crawl along, exercising gross motor skills. 2) Curiosity & discovery: pushing the hippo to make the balls go "pop, pop, pop" as it rolls along helps introduce baby to cause & effect. 3) Sensory: colourful bouncing balls, shiny reflections, and fun popping sounds help stimulate baby"s developing senses.