GROWING UP WITH BABY: The three functions of play gym, activity mat and ball pit meet the needs of baby growth, baby between 3 to 6 months is developing hand-eye coordination, so grasping for the dangling toys is good practice. As the baby gets older and can sit up, the pop-up mesh sides are effective at both containing the baby and their toys in one small spot. The playmat & floor gym becomes a ball pit. There are 30 colorful balls that easily get stored in the storage bag when not in use