All normal children develop language at roughly the same time, along much the same schedule.
Cooing:: 2-6 months of age
The first few months: the child gradually becomes capable of producing sequences of vowel-like sounds (particularly high vowels [i] and [u])
4 months: the ability to bring the back of the tongue into regular contact with the back of the palate – producing sounds similar to velar consonants [k] & [g] (cooing & gooing)
5 months: hear the difference between the vowels [a] and [i] and the syllables [ba] and [ga] -perception skills.
Babbling : 6-12 months of age
6-8 months: sitting up & producing a number of different vowels, consonants, and combinations like ba-ba-ba and ga-ga-ga (babbling)
9-10 months:
Recognizable intonation patterns to the consonant and vowel combinations being produced
Variation in the combinations (ba-ba-da-da)
Nasal sounds become common
Certain syllable sequences also appear (ma-ma-ma & da-da-da)
10-11 months:
Standing position
Capable of using vocalization to express emotions & emphasis.
More complex syllable combination (ma-da-ga-ba)
A lot of sound play & attempted imitations
The one-word stage: 12-18 months of age
12-18 months:
recognizable single-unit utterances
single terms are uttered for everyday objects ‘milk’, ‘cookie’, ‘cat’, ‘cup’, and ‘spoon’ [pun]
The two-word stage: 18-20 months of age
18-20 months: vocabulary moves beyond 50 words
Telagraphic speech: 2 years-old
2 years old, children produce utterances ‘baby chair’, ‘mommy eat’ • Interpretation depends on context.
Baby chair might mean: This is baby’s chair - Put baby in chair - Baby is in the chair
2-2½ years: The child produces ‘multiple-word’ speech
3 years:
Vocabulary has grown to hundreds of words
Better pronunciation