Medicare Part B does not cover routine hearing exams or hearing aids. Medicaid, however, may cover some of the cost of hearing aids, depending on the state you live in. That's because each state operates its own Medicaid program, and each program has slightly different rules and coverage.
Research shows that infants display behaviours that are important beginnings for theory-of-mind development (see details in Mooreâs and Sommerville âs papers in the chapter on social cognition 9,10). By age 2, children clearly show awareness of the difference between thoughts in the mind and things in the world.
The Sensorimotor Stage. According to Piaget's theory, all children develop cognitive abilities such as language in four stages. In the sensorimotor stage, which lasts until the child is around 2 years old, the emphasis is on movement and physical reactions.