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.
After age 4, the fat pad should decrease and inward tilting of the foot and ankle becomes more evident. When over-pronation is excessive, it can lead to pain in the feet, ankle, achilles tendons (heel cords), back and most commonly, the knee. Appearance of Excessive Pronation. When standing, your child's heels lean inward when viewed from behind. When standing, one or both of your child's kneecaps turn inward. Feet appear flat. Knee pain occurring after sports or increased activity. Knee pain may be worse when climbing stairs. The knee pain slowly goes away with rest. The soles and heels of shoes wear out quickly.