| Developmental Age | Motor Control | Cognition | Social Behavior |
| 6 weeks
|
Behavior: Lifts Head 45 degrees, Lifts head 45 degrees, Increasing extension at rest, Predominantly asymmetrical movements, total head lag in pull-to-sit decreases, Inserts hand in mouth and sucks, hands open, suck-swallow reflex, phasic bite reflex, rooting, suckling pattern, bottle/ bread-fed, vigorous suck, and coordinates suck, swallow, and respiration | Behavior: cries, coos, vocalizes when not crying, chuckles | Behavior: cries to communicate, calms to human face and voice, visual tracking (not across midline) |
| 3 months
|
Behavior: Asymmetric Tonic Neck Reflex, Tonic Labyrinthine, Labyrinthine Righting, Palmer Grasp Reflex, Upper Extremity Traction, Lifts Head 90 degrees, Lifts head in prone, Increasing Extension at rest, Predominantly Asymmetric movements, Total head lag in pull-to-sit decreases, Hands closed most of the time with spontaneous opening, hands swipe at mouth, grasps object placed in palm briefly, suck-swallow reflex, phasic bite reflex, rooting, suckling pattern, bottle/ bread-fed, vigorous suck, and coordinates suck, swallow, and respiration | Behavior: cries, coos, vocalizes when not crying, chuckles | Behavior: cries to communicate, calms to human face and voice, visual tracking across midline 180 degrees, first smile |
| 6 months
|
Integration of ATNR, TLR, Palmar Grasp, stepping, supporting, rooting reaction, phasic bite reflex
Appears: Body-on-body righting, rotary neck righting, protective extension downward and forward, prone equilibrium
Behavior: Hands are closed at rest less of the time, hands to midline in play, grasps objects placed in palm, first spoon feeding, disassociation of lips tongue, jaw begins with true sucking |
Behavior: secondary circular reactions (infant acts on environment to prolong interesting experiences), disyllabic utterances, increase in sounds produced | Behavior: early play, infant shows delight, laughs, and chuckles |
| 12-15 months
|
Appears: Equilibrium quadruped, standing, diagonal and rotary jaw movement
Behavior: walks with one or two hands held, Walks independently, inferior pincer grasp, pincer pad to pad grasp, superior pincer tip to tip grasp, and Appearance of diagonal and rotary jaw movement |
Behavior: first word is spoken and babbles sound more like sounds, object permanence is more secure, and more sophisticated means-end relationships | Behavior: shows an attachment style, and stranger anxiety |
| 30 months
|
Walks, can balance on one foot for a couple seconds, can put on an article of clothing, able to kick a ball, and hands are no longer used to getting on or off the floor | Abilities: follow two-step commands, follow instructions without demonstration, putting words together in simple sentences | Plays with other children and begins to establish rapport, identifies friends, and has become very curious about the world around them |
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