Describe the development of speech, from infancy to approximately 2 years of age

Speech is developed primarily in the first two years of the life of an infant.

Explanation:

The recognition of speech patters in children starts at infancy and is a precursor to the eventual understanding of language and speaking.

0-3 months the baby:

Recognizes different tones of voices

Coos  when it is happy

Cries to show hunger, tiredness and distress

By the time the kid reaches 6 months the kid starts to:

Laughs, chuckles and squeals

Cries to show it is distress ed

Begins to understand emotion in parent or carer’s voice

By the time it reaches 9 months:

Begins to recognize its  own name

Imitates simple words

By the time it reaches 1 year:

Uses vowels and consonants together to make repetitive sounds

Use gestures to ask for things

Understand more than it can say

By the time the kid reaches 18 months:

Vocabulary increases with children learning 10-30 words in a month

Repeats words and sentences

Use language to name belongings and point out named objects.

By the time the kid is 24 months old:

Both active and passive vocabularies continue to increase

Sentences become longer although they tend to be in telegraphic speech

After birth between 6 and 9 months babies start babbling and imitating. By 12 months or 1 year a baby's first words usually come out and by 18 months to 24 months children use approximately 45 to 50 words and will start saying short sentences. After that in 2 to 3 years these sentences are long consisting of 4 to 5 words.

Explanation:

A new born after crossing six months start babbling and imitating tones and speech of various sounds. They try to make various sounds in mouth. By 1 year, a baby's first words usually come out and 1 year 6 months they start to speak 50 words around. Next to that in 2 years they make short sentences by placing two words in it.

And finally in between 2 to 3 years they speak full sentence of four to five words or more than that. Gradually start speaking complex sentences and meaningful sentences. Word stocks and vocabulary increases day by day.