Background: Rapid changes in dietary patterns and lifestyles in Vietnam warrant monitoring the trends of weight, height and body mass index (BMI) among children. Objectives: To determine the trends of weight, height and BMI classification of Vietnamese children 6 - 15 years of age from 1992 to 2000 with reference to socioeconomic, urban and rural differences. Method: Data in the Vietnam Living Standard Survey (1992 - 1993) and the General Nutrition Survey (2000) were collected from representative samples of children.