Children’s little finger can not be straight, may be due to deformity healing, tendon injury and other factors. 1. Deformity healing: some babies may have fracture of the little finger, due to improper treatment or untreated, the symptoms of localized deformity healing, which will cause the child to appear the performance of the little finger can not be straightened, affecting the function of the finger. 2. Tendon injury: children because of finger trauma factors, will cause tendon injury, and then there will be localized swelling and pain as well as activity restrictions, resulting in children’s little finger can not straighten. There may also be other reasons why children’s little fingers are not straight, such as increased muscle tone due to neurological developmental abnormalities, etc. It is necessary to cooperate with the doctor to improve the examination and take different treatments according to different reasons.