critical brain development
rapid growth in size
voluntary reaching and grasping
preference for hearing own language
sensorimotor cognitive development: circular reactions and goal-directed behavior
expression of temperament
development of attachment
color, pattern, face, motion, and depth perception
understanding of basic principles of objects and motions
control of trunk; rolling over
crawling, sitting, and standing
imitation and deferred imitation
memory for familiar people, places, and objects
habituation
social smiling and laughter
stranger anxiety
use of gestures to communicate
cooing and babbling
first words; holophrases
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critical brain development
cruising, walking, and climbing
stacking and sorting toys; scribbling
ability to search for hidden objects
problem solving through active experimentation
rapid language acquisition and growth of vocabulary
evidence of attachment
separation anxiety
self-recognition and self-reference
categorization of self and others on the basis of age and sex
gender-typed toy play
development of self-conscious emotions
emergence of compliance and self-control
ability to play turn-taking games
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critical brain development
running
negotiating stairs
throwing and catching a ball
bowel and bladder control
self-dressing and self-feeding
development of self-concept and self-esteem
pretend play, parallel play, and social play
development of gender stereotypes and gender-typed preferences
egocentrism, animism, and preoperational thinking
two- and three-word sentences
development of multiple attachments
beginning literacy and media exposure
development of empathy
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