Is a knee crookedness norm in case of preschool children?

 Crookedness means bending from foot's oblong axis toward side and in this particular situation we may talk about crookedness of forearms, feet or shanks. We may talk about shank crookedness when legs of child who stands "at attention" resemble "X" letter.  

Shank crookedness in case of children before age of two is a normal situation (earlier, when one-year-old child starts walking, he has shank varus deformity. Than lines running from hips, through knees, up to feet resemble "O" letter). A doctor or pediatrician judge weather crookedness degree and, what is followed, shank bending is just a physiological case or diagnostics should be made.