Version May 2024
| Age | Evidence of normal cortical development |
| 6 to 12 months | Awareness of surroundings |
| Interaction with examiner (social smile, inquisitiveness, habituation) | |
| Cooing and gurgling, sometimes making of nonspecific "mama" and "dada" sounds | |
| Looks at and pats picture to show interest | |
| 12 to 20 months | 6- to 8-word vocabulary |
| Comprehends 1-step commands | |
| Points to 2 or 3 body parts | |
| Points at pictures | |
| 24 months | Names 2 or 3 body parts |
| Uses phrases and simple sentences | |
| Names pictures, follows simple stories | |
| 24 to 36 months | Concept of self (referring to self as "I," knowledge of name and age) |
| Completes sentences and rhymes in familiar stories | |
| 36 months | Counts 3 objects |
| Understands prepositional concepts (eg, "over" and "under") | |
| Asks questions | |
| Names 3 colors | |
| Begins to recognize letters | |
| 48 months | Copies a square and a cross |
| Begins to develop ability to rhyme | |
| 5 or 6 years | Spells monosyllabic words |
| Counts to 10 | |
| Recognizes numbers, letters, sight words | |
| 6 years | Copies a triangle |
| Reads and retells familiar stories | |
| 6 or 7 years | Does simple addition and subtraction |
| Reads polysyllabic words | |
| 7 years | Copies a diamond |
| Sounds out or decodes unfamiliar words |
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