We use typical development as a guide because it is the most efficient way of tracking progress of skill and knowledge development.
When it comes to speech, typical children have about 20 words at the age of 18 months.
| 2 years | 3 years | 4 years | 5 years | 5+ |
| G P B M T D N H w | K G F S ng | Y Z J L Ch Sh | Become aware of rhyming words and syllables. Can struggle with R, V and Th | Should be easily understood by anyone. May still struggle with Th (this, thumb) and sounds in consonant clusters with few vowels (scratch, hippopotamus, pumpkin) |
But when it comes to autistic children, these can be delayed or out of order.