Slight bending of the calf does not need special correction. After the child is 2 years old, the symptoms will basically disappear naturally. However, children must not be short of calcium, nor should they stand and walk prematurely. Normal children can only stand for 10 months, and then let go of 1 years old.
I don't know what you mean when you say that a small bone protrudes from the child's knee. You can go to the hospital to consult an expert. Basically, it's nothing serious.