The following are stages of language development for toddlers - ranging in age from 3 to 4 years of age.

Receptive

• Comprehend 1500 words by age 4
  
• Comprehend  complex and compound sentences
  

Expressive

• 900-1500 word vocabulary
• Sentence length: 4.3 words
• Minimal difficulties with sentence structures
• Can carry on long conversations
• Can complete on long conversations
• Can complete analogies
• Uses 'what', 'where', 'how', 'why'
• Speech is 90%-100% intelligible