The production of intentional, repetitive speech sounds (like 'ba-ba' or 'da-da') that a baby makes from around 6 months of age is called:

Vocabulary growth during pre-school years is largely supported by:

Arrange the following stages of language development in their correct chronological sequence: (K) Production of Sound (L) Recognition of Sound (M) Production of Words and Sentences (N) Use of Written Language (O) Final Stage of Mastery in Language Development