1. How to measure infant height. Measuring infant height is one of the important indicators to measure whether its growth and development is normal. Commonly used measurement methods include supine position, upright position, and sitting position. Among them, the supine position method is the most commonly used method and requires the use of professional measuring rulers and weighing machines for measurement. 2. The normal range of infant height. According to the standards issued by the World Health Organization, the normal range of height for infants aged 0-2 years should be between 45-90 cm. In addition, there are differences in height between male and female babies. Male babies are usually slightly taller than female babies. 3. Factors affecting infant height development