Language Development
100
By this age the child will coo and make noises in response to speech.
Birth to Five Months! :max_bytes(150000):strip_icc()/babys-first-year-clean-11-81c663dfe0df447ab76a838f1b414108.png)
200
At this age, the child will ask and answer why questions, engage in conversation and use sentences with 8 words or more. 
5 years old!
300
At this age, a child's speech is 90-100% intelligible though some speech errors may persist. Receptively, a child is able to group and categorize items and understand complex questions.
4 years old!
400
By this age, a child will begin to combine two words and will have a vocabulary of at least 50 words.
18 - 23 months!
500
By this age a child will use 3-word sentences, ask simple questions with inflection and speech intelligibility is approximately 50-75%. 
2-3 years old!
