The incidence of hip dysplasia in newborns is quite high, especially in babies with high maternal collar, premature babies, breech birth girls, etc. It is sometimes difficult for parents to detect hip dysplasia in their babies without obvious symptoms before the baby walks. It can only be detected through a systematic and correct examination. Checking methods are as follows: let the baby in a quiet state, bare both lower limbs, prone, legs straight and close together, observe both sides of the hip line is symmetrical, also can lie on the back, close both lower limbs, observe both sides of the femoral texture is symmetrical, the girl at the same time to observe both sides of the labia majora is symmetrical, generally unilateral dislocation of the affected side of the appearance of the hip line increased and upward, but the asymmetry of the hip line can not indicate that must be dislocated. Another inspection method is to put the child lying on his back, flex the knee, flex the hip 90 °, and then hold the child’s two knees with both hands at the same time adduction (i.e., the two knees are separated outward), the normal child’s two sides of the adduction can be up to 80 ~ 90 °, and even the outer side of the knee can touch the surface of the bed, if there is obvious asymmetry of the adduction, the two knees are hindered from separating outward, or the angle is smaller than 45 °, suggesting that the internal muscles are tight, the above two inspections should be carried out in the neonatal period. Both of these tests should be performed in the neonatal period for early detection of disease and early treatment. If the disease is not detected at an early stage, then after the child walks, it can be found that unilateral dislocation walks with a limp, and bilateral dislocation walks with a wobbly duck step; more than 1 year old, the hip is still dislocated, most of them need surgical treatment.