During the first year of a child’s life, his brain will double in size. Much of this growth occurs in a part of the brain called the cerebellum, which is in charge of physical development and motor skills. This development helps babies learn to control their bodies and movement. They learn to hold up their heads, to roll over, grasp objects, and even to stand up. Meanwhile, the visual cortex, the part of the brain that helps us see, changes rapidly, and your baby starts to recognize faces.