The book "MY LITTLE BIG MATH BOOK" illustrates the fundamental mathematical concepts children learn through everyday experiences, beginning with the very early stages of development. Lars Rönnbäck, the author, explores the acquisition of concepts such as identity, difference, and sameness by observing how children learn to identify and differentiate objects. The author then delves into set theory, discussing the creation of sets through extension and intension, as well as cardinality, union, and intersection. The text further explores the development of counting and number systems, showcasing how children learn to associate patterns with specific numbers and grasp the abstract nature of numbers. The author concludes by connecting these concepts to infinity and the ability to count abstract thoughts and experiences.