Hearing loss, known as hearing impairment is the decrease hearing permanently or reversibly. It can affect one or both ears and can be partial or total. Children may be born with hearing impairments or suffer hearing loss during a later stage. The most common causes of hearing loss in infants and children include ear infections, infections in the mother during pregnancy or childbirth, problems during birth (eg lack of oxygen), childhood infections, certain medications, permanent exposure to excessive noise or heredity, among others. Babies should have a hearing test before they are one month old. If the deficiency is not detected in time, the child may have problems in language development. Treatment depends on each case, but may consist of administering medications, surgery, a hearing aid or cochlear implants, or therapy with a speech therapist, which in severe cases require learning sign language.