overweight is a BMI greater than or equal to 25; and; obesity is a BMI greater than or equal to 30. For children, age needs to be considered when defining overweight and obesity. Children under 5 years of age. For children under 5 years of age: overweight is weight-for-height greater than 2 standard deviations above WHO Child Growth Standards ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.