The general causes of infant leg bending mainly include the following two categories: 1, physiological factors caused by the infant’s muscle tone is slightly high, especially the inner thigh muscle tone is higher than the outer, it will cause the lower limb muscle tone on both sides of the imbalance will cause the infant’s leg slightly bent, with the children’s age, the lower limb muscle balance on both sides of the children’s leg bending will be improved at this time. 2, due to the infants Symptoms caused by rickets, in infants with rickets will often cause leg bending, children will be manifested as X-shaped legs, you can give children timely supplementation of vitamin D as well as calcium to alleviate.