What is the correct method for measuring the length of a 14-month-old child?

The supine recumbent position is the preferred method for measuring the length of a 14-month-old child because children of this age typically have not yet mastered standing independently or may require support to do so. In the supine position, the child lies flat on their back, allowing for a straightforward and accurate measurement from the top of the head to the heel of the foot. This method is particularly suitable for infants and toddlers, as it ensures their safety and comfort during the measurement process.

Standing height might be used for older children who can stand unassisted, but a 14-month-old may not have the stability or ability to stand straight without support. The prone recumbent position involves measuring a child while they are lying on their stomach, which is less common and could be less accurate, as it can lead to difficulty in ensuring the child is fully extended. The side-lying position is not a standard method for length measurement either, as it does not provide the necessary straight alignment required for an accurate length assessment. Thus, the supine recumbent position is the most appropriate choice for this age group.