It is important to remember that developmental charts are only a guide to the ages and stages of development. They are not perfect for every child. All children are individual and unique; they will progress roughly in the same order but not necessarily all at the same speed as their peers.

Observe three children of the same age and make a note of their conversational style.

• What words do they use?
• Do they use sentences?
• Is the range of vocabulary equal or does it vary according to gender, topic, or time of day?