At this age, a simple game of peek-a-boo will fascinate your baby. He's starting to understand the concept of object permanence. In other words, he now knows that things don't go away forever when they leave his sight. That's why he loves games where people or things appear and disappear. In fact, one of the easiest ways to keep your seven month old occupied is by hiding an object under a blanket for him to discover. Try some other baby games, too, such as pat-a-cake, rolling a ball backwards and forwards or banging things together to see what sound they make.