Any function object that is a class attribute defines a method for instances of that class. It is not necessary that the function definition is textually enclosed in the class definition: assigning a function object to a local variable in the class is also ok.
Most children are born with very little arch in the feet. As they grow and walk, the soft tissues along the bottom of the feet tighten, which gradually shapes the arches of the feet. Children with flexible flatfoot often do not begin to develop an arch until the age of 5 years or older. Some children never develop an arch. If flexible flatfoot continues into adolescence, a child may experience aching pain along the bottom of the foot. A doctor should be consulted if a child's flatfeet cause pain.
Normally, flat feet disappear by age six as the feet become less flexible and the arches develop. Only about 1 or 2 out of every 10 children will continue to have flat feet into adulthood. For children who do not develop an arch, treatment is not recommended unless the foot is stiff or painful. Shoe inserts wonât help your child develop an arch, and may cause more problems than the flat feet themselves.