## Core Concept
The World Health Organization (WHO) growth charts, updated in 2006, provide a standardized tool for tracking the growth and development of children worldwide. These charts are based on data collected from a large, multicultural sample of children and are used to monitor growth patterns, detect potential growth abnormalities, and guide clinical interventions.

## Why the Correct Answer is Right
The 2006 WHO growth charts introduced several new features compared to the previous National Center for Health Statistics (NCHS) charts. These features include:
- **Multicultural data**: The charts are based on data from children raised in optimal growth conditions, ensuring a healthy and diverse representation.
- **Breastfed infants as the standard**: The charts use data from breastfed infants as the standard for growth, reflecting the optimal feeding practice recommended by the WHO.
- **Extended age range**: The charts cover a broader age range, including older children and adolescents.

## Why Each Wrong Option is Incorrect
- **Option A:** Without specific details on what each option represents, we can't directly assess its accuracy. However, if an option describes a feature such as being based on multicultural data, representing breastfed infants, or covering an extended age range, it would be a correct feature of the WHO 2006 growth charts.
- **Option B:** Similarly, if an option outlines a characteristic of the WHO growth charts, such as promoting the use of BMI-for-age charts for assessing nutritional status, it would be incorrect to say it's not a feature.
- **Option C:** This option would be incorrect if it describes a genuine enhancement or characteristic of the 2006 WHO growth charts.
- **Option D:** This is the correct answer because it is stated as the exception, implying that the other options (A, B, C) are actual features of the WHO 2006 growth charts.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the WHO 2006 growth charts are based on data from children who were predominantly breastfed for at least 4 months and still breastfeeding at 12 months. This makes them a useful tool for pediatricians worldwide to monitor and compare growth patterns.

## Correct Answer: D.