- The minimum values of age-dependent speech production ability a child should reach.
| Age (months) | Minimum values | Age (months) | Minimum values |
|---|---|---|---|
| 0 - 1 | 0 - 0.5 | >9 - 10 | 8 - 9 |
| >1 - 2 | 0.5 - 1 | >10 - 11 | 8 - 9 |
| >2 - 3 | 1 - 2 | >11 - 12 | 9 - 10 |
| >3 - 4 | 2 - 3 | >12 - 13 | 9 - 10 |
| >4 - 5 | 3 - 4 | >13 - 14 | 9 - 10 |
| >5 - 6 | 4 - 5 | >14 - 15 | 10 - 11 |
| >6 - 7 | 5 - 6 | >15 - 16 | 10 - 11 |
| >7 - 8 | 6 - 7 | >16 - 17 | 10 - 11 |
| >8 - 9 | 7 - 8 | >17 - 18 | 10 - 11 |