(d) Quantitative development refer to the changes children encounter as they acquire more knowledge and grow physically larger and stronger. An example of quantitative differences would be a child who, after two years, has grown two inches and gained 10 pounds. Growth in height and weight indicates a quantitative difference. Qualitative development refers to the changes in the way children think, behave, and perceive the world differently as they mature. An example of qualitative differences would be a child that at a young age has difficulty understanding the perspectives of others (otherwise known as egocentrism)