This rainbow roller toy is just right for our growing baby. He is 7 months old, sitting, and commando crawling. This toy is giving him good practice grasping, and it is a good size to fit his hand around. He drops it, then it rolls a bit, and the ball inside keeps his attention and he watches it roll away (object permanence). Then he flops himself down onto his belly, and commando crawls after it. Repeat grasping, dropping, watching, retrieving. Quite entertaining. Plus, it is made of wood and non-toxic paints. I love Plan Toys.