We understand how that is a matter of great concern for the parents. It is also important to practice speech. To practice breathing in and out using the harmonica, or moving the tongue proves to be effective. These things would be output practice for speech. Relatively more important is input practice. Reviewing abundant amount of words and sentences using books and flash cards would overwhelm the brain with information, leading to speech. Please be aware that parents’ anxiety being over-concerned will convey to the child and work negatively on his development.