Children’s height in the morning and evening has a certain difference, to be measured at a fixed time each time the height shall prevail, generally choose the morning after waking up the height measurement as a standard. The baby’s spine is not affected by external forces after waking up in the morning, the height is more accurate, after a day of activities, due to sports or activities leading to spinal compression, in the evening the baby’s height is a little shorter than in the morning, the general difference of about 1cm. Therefore, the height in the morning is mostly used as a measure of the baby’s height development. Moreover, the height measurement in the same period of time can only reflect the baby’s height development, so it is best to choose the same period of time to give the baby regular height measurement to assess the baby’s physical development. If you find that your baby’s height development is lower than that of children of the same age, it is recommended that you consult a doctor in time to identify the cause of the disease and provide intervention treatment if necessary.