Hearing is a sense that is developed at birth, hence already during foetal life, in the womb, the child is able to perceive sounds. During the first year or so, development progresses thanks to sounds - both in terms of understanding words, making sounds up to the development of speech, but also from a motor and coordination point of view, when sounds provide a stimulus for the child to take action. Hearing disorders can therefore have an adverse effect on a child's development.