A normal skeletal system is essential for a healthy body. Some people have problems with the bone and joint system for various reasons, and some diseases that should be treated as early as possible have poor results due to delays, so parents should all be concerned about pediatric orthopedic problems. Some congenital orthopedic deformities in young children with less obvious symptoms are not often easily detected by parents, and there are also some abnormalities that occur during development that often go unnoticed. However, if early detection, early diagnosis and early treatment will achieve satisfactory results. I. Neonatal period 1. congenital appearance of obvious limb anomalies. Most of these anomalies can be detected without professional knowledge and have good results if treated early. They include congenital limb defects, polydactyly, syndactyly, oblique neck, corpus cavernosum, funnel chest, etc. 2. Injuries caused by uneventful delivery. Such as clavicle fracture, brachial plexus injury, cerebral palsy (one side or part of the limb cannot move normally and is asymmetric with the opposite side), etc. 3.Differentiate the difference between postural deformation and true skeletal abnormalities caused by fetal position, such as horseshoe foot. 4.Do hip joint screening test. To detect congenital (developmental) hip dysplasia and dislocation (manifested by asymmetric skin pattern of the upper two thighs and abnormal activity of the hip joint), which are easily overlooked. Second, the toddler period 1, learning to walk too late to pay attention to the skeletal muscle muscle strength is abnormal, especially whether the two sides of the symmetry, seen in cerebral palsy and polio, and to exclude intelligence is abnormal. 2, the toddler car is harmful to the skeletal muscle development. 3, O-leg and X-leg are very common at this stage. 4. Early consultation for limp and duck gait to rule out hip dislocation. Third, preschool 1, after 3 years of age O-leg should be especially careful to distinguish whether there is growth epiphyseal disease. 2.Kneeling and sitting have a great impact on the joints of the lower limbs. 3.The proportion of X-shaped legs is more than 50% at the age of 2 to 4. 4. Flat feet are closely related to individual ligament laxity, muscle tone and X-shaped legs. IV. Primary school period 1. Paroxysmal squamous neck syndrome, which may be related to repeated upper respiratory tract infections. 2.Growing pains are related to calcium metabolism, sports injuries or fatigue, which are common in this age group. 3. Hip pain, pay special attention to ischemic necrosis of the femoral head in children, but exclude transient hip synovitis. 4.Fractures of the extremities are particularly likely to occur in this age group. 5, walking feet are “outward eight”, running is more significant; and standing squatting to a certain extent can not be flexed hip, otherwise, when sitting backwards and falling, the position of the knees apart before squatting, sometimes accompanied by sitting position when one leg can not hitch to the other leg; as a child has been repeatedly done with benzyl alcohol soluble penicillin intramuscular injection, this is hip contracture. Fifth, adolescence 1, idiopathic scoliosis, sometimes easy to be ignored, more common in women, manifested as left and right shoulder height asymmetry, easy to find in summer when thin clothing. 2. Tumors of the skeletal system, especially malignant tumors, have a tendency to increase, manifesting as localized soreness and pain, and there may be no obvious change in appearance.