1. 2-3 Months
1.1. Motor
1.1.1. Lift head, sit with support
1.1.2. Hold object if placed in hand, begin to swipe at objects
1.2. Perception
1.2.1. Preference for 'attractive' faces (Langlois et al 1987)
1.3. Sensory
1.4. Language
1.5. Communication
1.5.1. Modify gaze (make/break eye contact)
2. 0-1 Months
2.1. Motor Skills (Bee & Boyd)
2.2. Perception
2.2.1. Intermodal perception begins (Gibson 2002)
2.3. Sensory
2.3.1. Colour vision
2.3.2. Visual acuity: 20/200
2.4. Language
2.4.1. Vegetative state, reflexive sounds, pre-intentional
2.5. Communication
2.5.1. Startle response
3. 1-2 Months
3.1. Motor
3.2. Perception
3.3. Sensory
3.3.1. Object tracking - ability to follow moving object
3.4. Language
3.5. Communication
3.5.1. Fix gaze and hold attention
4. 3-4 Months
4.1. Motor
4.2. Sensory
4.3. Perception
4.4. Language
4.5. Communication
4.5.1. Interested only in exaggerated facial expressions
4.5.2. Selectively smiles
4.5.3. Focus on one or more figures (Bowlby 1969)
5. 4-5 Months
5.1. Motor
5.1.1. Roll over, creep
5.2. Perception
5.3. Sensory
5.4. Language
5.4.1. Cooing state begins til 7 months
5.5. Communication
6. 5-6 Months
6.1. Motor
6.1.1. Sit with self-support
6.2. Sensory
6.2.1. 20/20 vision
6.3. Perception
6.3.1. Well developed intermodal perception - combining info from 2+ senses resulting in single perception
6.4. Language
6.5. Communication
6.5.1. End of reflexive communication
7. Sensorimotor Stage (Piaget)
7.1. Can differentiate between self and objects
8. Holophrastic Stage Two Word Stage (18-24)
8.1. Beginning of syntactical development
8.2. Stage 1 of Brown's Stages - 50-60 words, average of 1.75 MLU, nominate, express recurrence, negate, semantically locate, possess, attribute, demonstrate
9. 7-8 months
9.1. Object permanence (Piaget)
9.2. Language
9.2.1. Appear to listen to others' conversations, recognise familiar names
10. 6-7 months
10.1. Communication
10.1.1. Stranger anxiety emerges
10.1.2. Becomes intentional
10.1.3. Secure base behaviour in attachment (Bowlby)
10.2. Language
10.2.1. Babbling stage begins
11. 9 months
11.1. Communication
11.1.1. Separation anxiety begins
11.2. Language
11.2.1. Proto-words begin
12. 18 months
12.1. Language
12.1.1. Follow two-part instructions
12.2. Sensory
12.2.1. Detect location of sound accurately
13. 7-9 months
13.1. Motor
13.1.1. Sit without support
13.1.2. Transfer objects between hands, pincer grasp
14. 10-12 Months
14.1. Motor
14.1.1. Pull self up to stand, walk with and without support, squat
14.1.2. Grasp spoon across palm but poor aim at mouth
14.2. Language
14.2.1. First word may appear, phonemic expansion, syllable-like sequence
14.2.2. Understands several words in context
14.3. Communication
14.3.1. Joint attention develops, wave goodbye
15. 10 Months
15.1. Communication
15.1.1. Pointing
16. 12-14 Months
16.1. Object recognition (and play, Buckley)
17. 15-18 Months
17.1. Large doll play
17.1.1. Closely related to daily living, represents objects in child's concepts
18. 18-21 Months
18.1. Small doll play
18.1.1. More difficult symbols, less closely linked perceptually
18.2. -24 months
18.2.1. Two-dimensional symbols
18.2.1.1. Recognition of pictures, bears little perceptual similarity to objects