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.
Flat feet. Introduction. Having flat feet, or 'fallen arches', means that your feet have low or no arches and press almost completely flat against the ground. The arch, or instep, is the middle part of the foot that's usually raised off the ground when you stand, while the rest of the foot remains flat on the ground. In young children, this arch isn't always visible because of the baby fat and soft tissue in their feet.