Why are my child's pinky fingers curved inward?

Simple clinodactaly. When pinky fingers are turned slightly toward the middle of the hand, the term used is clinodactaly. When examined under x-ray, there is an angulation to the middle segment of that finger. It is a benign and potential inheritable process. It occurs in normal people and sometimes in higher frequency with certain syndromes.
Curved pinky fingers. If it si from birht she may have congenital deformity adn your pediatrcian should look a this and mayneed to look if htere are any other anomalies associated with it. If it is acqurieed then too the md shoudl look into the cause for it.