Sleeping, looking around, rolling, being changed, crying –whatever it is that your baby is doing in his crib he is still seeing all the same things. One thing you can do to stimulate your infant is to move his crib and give him a different vantage point. How simple!
Be sure to explain to your baby that you have moved his crib and tell him what he now can see or point out where the things he could see before are now located relative to his new location: "There is the window." "There is the closet." "There is the door."