Most of the newborn’s leg bending is normal phenomenon, related to the imperfect development of the skeleton; there may also be abnormalities, such as the manifestation of increased muscle tone, need to consult the doctor in time, the doctor to clearly diagnose, to avoid delaying the condition. 1. Normal phenomenon: As newborns in the mother’s body is the lower limbs curled state, leg curvature is high, muscle tone is relatively high, the emergence of a slight leg bending most of the symptoms is normal, with the age of the month gradually increased, the development of the lower limbs gradually improve the above symptoms will be slowly alleviated. 2. Abnormal phenomenon: Due to the developmental delay or cerebral palsy, newborn babies show obvious symptoms of leg curvature, which is an abnormal phenomenon, and need to seek medical treatment as soon as possible. Parents are advised to take their newborns to the hospital for a detailed examination, and if it is caused by disease factors, it needs to be treated as soon as possible to minimize the damage to the newborns.