How to identify speech and language delay in a child?

If the child has not achieved below milestones: 12-17 Months: Non-verbal answers to simple question, labeling objects/people in 2-3 words, imitate simple words.18-23 Months: Makes animal sounds, foods by common name, use of pronouns, 2 words phrases. 2-3 Years: Few spatial concepts, use of descriptive words, 3-words phrases, answer simple questions. 3-4 Years: Groups objects, use of speech sounds and consonants, clear speech, describe objects, ask questions. 4-5 Years: Understands spatial concepts and complex questions, describes how to do things, categories objects, answers "why" questions.

When the parent should intervene?

There is no harm in getting a detailed assessment by an expert if the parents or the school teacher finds any issue in the speech or language development of the child. It can help in determining the cause of delay. Early assessment and intervention are always beneficial, even if it is a temporary delay or child is a late bloomer.