The definition of normal depends on whether you are facing an underlying disease. Generally speaking, normal children with immature skeletal development will increase in height and weight as time progresses, regardless of their age, and unexplained weight loss in children for several months in a row is a sign of a disease. The development of the nervous system determines the progress of growth, and growth stagnation for 6 months indicates a clear tendency to abnormalities, and an endocrinologist should be consulted. However, it should be known that a child gains at least 4cm in height in 1 year. It is quite important for pediatric orthopedic surgeons and parents to understand and be familiar with some growth indicators, the following are indicators of normal movement in children. 2 months Prone can control head movement, supine can control some head movement 3 months Grip reflex disappears 4 months Supine head movement freely, can turn over from prone to supine 6 months Prone position, hands support body head and chest can be lifted 8 months Can sit independently, grasp toys 10 months Can crawl, can stand on their own with the help of furniture 12 months Walk independently or walk with help 18 months Hand deviation occurs 2 years Jumping, know their own name 3 years alternate feet up stairs, stand on one foot for short periods, knows age and sex 4 years jump on one foot, throw ball over head 5 years jump, dress independently, jump and hop