Version May 2024
| Milestone | Age at acquisition |
| Fixes gaze briefly; habituates to stereotyped auditory, visual, and tactile stimuli | At birth (40 weeks post-conceptional age) |
| Smiles responsively, gurgles | 2 to 3 months |
| Visual tracking of a bright object to 180° | 3 months |
| Rolls over, holds head upright when pulled from supine to sitting | 3 months |
| Reaches out for objects | 4 to 5 months |
| Maintains sitting position independently | 6 months |
| Grasps objects using thumb and index finger pulp | 8 to 9 months |
| Crawls, babbles, uses nonspecific "Mama" and/or "Dada" sounds | 9 to 10 months |
| Pulls up to stand and walks with support | 10 to 11 months |
| Walks independently, uses 2 to 3 clear words, including specific "Mama" and "Dada" | 13 to 14 months |
| Can point to body parts, use simple phrases | 18 to 19 months |
| Names body parts, states age, uses phrases | 24 months |
| Pedals tricycle, speaks in sentences, asks questions, likely toilet trained, can name primary colors | 36 months |
| Masters concepts of alphabets and numbers | 4 to 5 years |
| Able to read simple words, add, subtract | 5 to 6 years |
| Concepts of division, multiplication, geography; general information like cities, states, large rivers, oceans, etc | 7 to 8 years |
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