Any attempt to trace the development from the noises babies make to their first spoken words leads to considerable difficulties. It is agreed that very enjoy making noises, and that during the first few months one or two noises sort them-selves out as particularly indicative of delight, distress.sociability, and so on. But since these cannot be said to show the baby's intention to communicate, they can hardly be regarded as early forms of language.It is agreed, too, that from about three months they play with sounds for enjoyment, and that by six months they are able to add new sounds to their repertoire (能发出的全部声音). This self-imitation leads on to deliberate imitation of sounds made or words spoken to them by other people. The problem then arises as to the point at which one can say that these imitations can be considered as speech.