Often parents have such questions, why I can not measure the height of the child, and sometimes also high and low it?
First of all, the measurement of height appliances should be the impact of thermal expansion and contraction and not easy to crack the material, such as with a soft ruler with cloth painted, not easy to use the stretchy pure plastic products. Before measuring should check whether there are cracks in the measurement bed, whether the head plate is at right angles to the bottom plate, whether the footboard table is placed smoothly, whether the position of the column and the slide side plate is correct, and check whether the scale on the measurement bed and column is accurate with the standard ruler (2 meters long, accurate to the millimeter scale steel ruler), if the full length (2 meters) and the standard ruler difference of 0.5 cm or more can not be used. The same requirement applies when choosing a soft ruler. The length of a child under 3 years of age should be measured in the prone position. The child is placed on his or her back on the middle line of the bottom board of the bed, and the assistant fixes the child’s head so that it touches the headboard. At this point, the child’s face is upward, both ears are at the same level, and the line connecting the upper edge of the second gallery and the lower edge of the orbit on both sides forms an imaginary plane perpendicular to the floor. The measure is located on the right side of the child, and the left hand holds the child’s two knees so that the two lower extremities touch each other and are close to the base plate, while the right hand moves the foot plate until it touches the heels on both sides. Bilateral scaled measurement bed should pay attention to make the sole side of the foot in close contact with the measuring tape, and make the surface of the footboard perpendicular to the latter, read the scale accurately to 0.1 cm.
When measuring the height of children and adolescents over 3 years old, the person being measured should take off shoes, socks, hats and clothes, wearing only an undershirt and shorts, standing in a positive posture, with both eyes looking straight ahead, chest slightly raised, abdomen slightly tucked, both arms hanging naturally, fingers together, heels close together, toes separated at an angle of about 60 °, heels, hips and between the two scapula angles (such as the two scapula angles when using a soft wall ruler to measure) several points at the same time The head is kept in an upright position while leaning against (touching) the column. The measureer holds the sliding side plate and slides it gently downward until the bottom of the plate touches the cranial vertex (the highest point at the top of the skull), then observe whether the posture of the measured person is correct, and read the number shown on the column at the bottom of the sliding side plate after the correction meets the requirements, and record to one decimal point in centimeters. Note that the eyes of the measurer should be on a level with the sliding side plate.
In addition, the time of measurement should be consistent. Because, the human height varies throughout the day. Generally the morning is 1 to 2 cm higher than the evening, and the change in height during the day is highest in the morning and lowest in the evening. This is due to the decrease in the water content of the discs, the thinning of the discs, the increase in the curvature of the spine and the shallowing of the foot arches as a result of the day’s activities and the pressure of the weight. It was previously measured in the morning, and this time it should also be measured in the morning so that it is comparable.