From Head to Toe, Measure Length as So

Selecting Equipment to Measure Recumbent Length
Recumbent length (length that is lying down) is measured in children from 0 – 2 years of age. In general, the recumbent length is about 0.7 cm more than standing height (i.e., standing height is 0.7 cm less) when compared on the same individual. It is recommended to use the age cut-off of 2 years when determining whether to use standing height or recumbent length. However, in certain circumstances when children are unable to stand on their own recumbent length may be used up until 3 years.

Recumbent length is measured with a length board or an infantometer. Length boards have a fixed headpiece and a movable foot piece perpendicular to the surface of the board. Similar to stadiometers, length boards can be made out of wood, plastic, metal or combination of materials. What is most important is having a durable and smooth surface that is moisture resistant.

Equipment Setup
The length board should be placed on a flat, stable surface such as a table or floor. Once an adequate location has been determined the length board should be setup following manufacturing guidelines. A thin cloth or soft paper may also be placed on the length board for sanitary reasons.

Equipment Calibration
After setup, calibration should occur following similar procedures we reviewed for standing height. The rod should be placed between the footboard and the moveable headboard as demonstrated in this video (starting at 1:30).

Check the reading of the length board to ensure it measures exactly the height of the rod. If the measurement does not match, check the setup and location of the equipment and make any needed adjustments. If the equipment is unable to be properly calibrated do not use it. Always ensure to record the calibration value prior to conducting any measurements following measurement protocols. Once calibrated, the equipment should not be moved during a measurement session. If moved, the equipment should be re-calibrated. Calibration should occur at the start of each measurement session.

Equipment Care
Length boards should be wiped down with sanitizer after every child’s measurement to prevent the spread of germs. Cleaning the equipment at the end of the session is also important to extend the life of the equipment. Length boards should be taken apart following manufacturing guidelines. It is recommended to store in a temperature controlled environment, especially wooden versions, to maintain the integrity of the equipment. There are also carrying cases available for transport.