Baby height growth general rule Baby height refers to the vertical distance from the top of the head to the bottom of the foot, it can reflect the level and speed of growth of the whole body of the child. Since it is difficult to measure accurately when babies under 3 years old are standing up, they are measured in the supine position and the result is the length. 0-1 Babies are born with a length of about 50 cm; they grow fastest in the first six months after birth, with an average growth of 3.5 cm per month in the first three months; 2.0 cm per month from 3 to 6 months; and 1.5 to 1.0 cm per month from 6 to 12 months. The average growth is 25 cm by the age of 1 year. 1-3 The growth pattern of body length is the same as that of body weight, which gradually decreases after 1 year of age. The annual growth in length is about 10-12 cm between 1 and 2 years of age; later it increases by 5-8 cm per year. Compared to the length at birth, it is about 1.5 times longer at 1 year old and about 2 times longer at 4 years old. Baby’s height curve When the child’s height is expressed in terms of percentile, the range of the 3rd to 97th percentile is classified as normal. When the height is below the 3rd percentile it is considered short and above the 97th percentile it is too tall. This is when you need to get help from a doctor to determine if your child’s growth is a normal variation or if something is really wrong. Because growth is a continuous and dynamic process, it is sometimes more important to measure height regularly to see how fast it is growing than absolute height, and to detect problems. If the annual growth rate is less than 70% of the normal growth value, or if the growth curve gradually deviates from the original trend and gradually flattens out, you need to find the cause with your doctor. Parents should not be anxious because the measurements are slightly lower than the normal standard average. It is important to compare your child’s height with children of the same race, socio-cultural background, gender, and average parental height for reference and value.