This book provides theoretical background for the proper management of physical activities for children at an early age in an aquatic environment so as to be beneficial for the child, while at the same building the foundations of the child's primary swimming abilities. This is not a textbook with individual techniques, but a professional text enabling the reader to understand the rules of early human ontogenesis, the development of motor skills and the basics of swimming education. The presentation follows the child's developmental stages incorporating related specialized topics (methods for physical stimulation of the child, prerequisites for positive experiences during activities in aquatic environments, submersion, saving one's self).