The theme of the paper "Development of the concept of measurement in early and preschool age" is based on play and practical experiences, enabling children to understand the process of learning and developing the concept of measurement. The paper aims to investigate how basic mathematical concepts such as measurement, equality, comparison and variability develop in the early stages of childhood and how these foundations can be laid in a way that will support further learning and understanding of mathematical concepts. This thesis investigates how children of early and preschool age acquire and develop measurement skills through various activities and teaching methods. The aim of this work is to examine how children of early and preschool age develop basic concepts of measurement, analyze the effectiveness of different methods and tools for teaching measurement, and study the influence of games and practical activities on the understanding of measurement concepts. This paper contributes to the understanding of how children acquire basic mathematical concepts and provides guidelines for improving the approach to teaching measurement in early childhood and preschool education institutions.