**Core Concept**
Shakir's tape is a growth assessment tool used to measure the growth of children, particularly in the context of assessing growth in patients with conditions such as Turner syndrome or other growth hormone deficiencies.

**Why the Correct Answer is Right**
Shakir's tape is specifically designed for use in children aged 2-18 years, allowing for the measurement of growth and identifying potential growth hormone deficiencies. The tape is applied at the same time each day, usually in the morning, to obtain accurate measurements. This method is particularly useful in pediatric endocrinology for monitoring growth patterns.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Shakir's tape is not typically used in infants or newborns. Growth measurement in this age group may involve other methods such as growth charts or anthropometric measurements.
**Option B:** This option is incorrect because Shakir's tape is not a general-purpose growth assessment tool for adults. Adult growth and development are monitored using different methods and criteria.
**Option C:** This option is incorrect because Shakir's tape is not primarily used in the assessment of body mass index (BMI) or weight-for-age in children. While it may provide some information on growth patterns, it is not a direct measure of BMI.

**Clinical Pearl / High-Yield Fact**
Shakir's tape is a valuable tool in pediatric endocrinology for monitoring growth patterns in children with growth hormone deficiencies or other conditions affecting growth. It is essential to apply the tape at the same time each day for accurate measurements.

**Correct Answer: C**