Below is a chart with the different stages of language acquisition a child will go through. Today most children are closely monitored by a physician to make sure they are hitting these very important milestone in language development. If they are not the child may be referred to a speech therapist to help them work on building their language acquisition.
The chart below is a little more specific about in discussing the universal stages of language acquisition. According to Chomsky it does not matter what language a child is learning they will to go through the same stages of development.