Reading this charming storybook to your preschooler is a wonderful way to introduce them to the fact that you wanted them very much but had trouble having them. Fortunately, a "very good doctor" helped mommy and daddy fulfill their dreams.The very basic fact that it takes an egg and a sperm to make a baby is introduced, making it a perfect platform for discussing In Vitro Fertilization with your child later on--when they become more aware of "how babies are made."