Solitary play
Plays alone, enjoys others' presence, focuses on own activity (infancy)
Parallel play
Plays alongside others, not with them; common in toddlers (toddler)
Associative play
No group goal, often follows a leader (preschool)
Cooperative play
Organized, with rules, establishes leader/follower relationship (school-age)
Trust vs Mistrust
Erikson's stage for birth to 1 year; developing a sense of trust in the world
(infancy)
Autonomy vs Shame & Doubt
Erikson's stage for 1-3 years; developing independence and self-control (toddler)
Initiative vs Guilt
Erikson's stage for 3-6 years; developing a sense of purpose and direction
(preschool)
Industry vs Inferiority
Erikson's stage for 8-12 years; developing competence and skills (school-age)
Identity vs Role confusion
,Erikson's stage for 12-20 years; developing a sense of self and personal identity
(adolescence)
Intimacy vs Isolation
Erikson's stage for 20-40 years; forming intimate relationships with others (young
adult)
Generativity vs Stagnation
Erikson's stage for 40-65 years; contributing to the well-being of future
generations (middle adult)
Integrity vs Despair
Erikson's stage for 65+ years; reflecting on life and accepting its meaning (late
adult)
Head lag
Inability to hold head up at 1 month, a developmental milestone (infant)
Moro reflex
Startle reflex present in infants, absent at 4 months (infant)
Anterior fontanelle
Soft spot on an infant's skull, closes around 18 months (infant)
Tonic neck reflex
Postural reflex in infants, diminishes by 2 months (infant)
Social smile
First appears around 2 months, in response to stimuli (infant)
, Parallel play
Plays alongside others, not with them; common in toddlers (toddler)
Sphincter control
Develops around 30 months, a milestone for toilet training (toddler)
Imitative play
Play involving imitation of everyday activities, common at 4-5 years (toddler)
Temporal perception
Improves around 7 years, developing concepts of time (school-age)
Pincer grasp
Ability to pick up objects between thumb and index finger, develops around 8
months (toddler)
Negativistic
Tendency to resist direction, common in toddlers (toddler)
Imaginary friend
Common at 4 years, a sign of imaginative play and cognitive development
(toddler)
Cooperative play
Organized, with rules, establishes leader/follower relationship (school-age)
Can turn from back to stomach