How fast do babies grow? What do they eat? And how do we take care of them? Kids get a great introduction to human growth and development as they observe a baby” s antics through the eyes of an older sister. Young readers discover that a newborn sees only in black and white and can taste sweet, bitter, and sour, but naturally prefers sweet. They see how a baby likes to imitate and can even learn from playing peek-a-boo. And readers also find out just when a baby will be ready to do other things.