Accurate measurement of height needs to pay attention to the “four same”: ① the same time, because after standing or sitting up, the vertebral space of the human spine will be compressed, morning and evening height will be different, the same time measurement to be comparable; ② the same measuring tape; ③ the same measurer, different people, the ruler card in the head of the tightness will be different; ④ the same child Standing method, shoes off, heels, hips, shoulders and head all against the wall, chest up, stomach in, waist as straight as possible, eyes level, head not too tilted, otherwise the highest point of the head can not be measured.
If you measure at home, you can draw a line on the wall, not every measure out the specific height, just distinguish the gap with the previous January. When measuring at home, be sure to use a triangular ruler, or a hard book, one side against the wall, the other side and the ground level.
From time to time, parents and friends will say, “My child grew by 2cm last month, but why did he not grow at all this month?” This is mainly related to the measurement error, the growth rate of several months can be used to find the growth rate (Note: usually do not measure height too often, generally once a month, otherwise it is easy to cause psychological pressure on the child, too much psychological pressure is not conducive to growth).