Take classic stacking fun to new heights! Three chunky train cars are just the right size for baby to grasp and hold or stack, nest and connect. Stacking the cars from big to little or nesting one-inside-another helps baby understand size relationships and how things fit together. Roll them along to encourage pushing and crawling. Features: Three chunky train cars are just the right size for baby to grasp and hold. Connecting the train cars helps baby develop eye-hand coordination, too.? Connectable train cars with wheels that roll encourage baby to push the train and crawl along, exercising gross motor skills.