Child development Study Guide

📖 Core Concepts Child development = biological, psychological, emotional changes from birth to adolescence. Periodization: Early childhood (0‑5 yr), Middle childhood (5‑10 yr), Adolescence (puberty 10‑12 yr to adult maturity). Ecological systems (Bronfenbrenner): microsystem → mesosystem → exosystem → macrosystem; bidirectional influences. Piaget’s stages: Sensorimotor → Pre‑operational → Concrete‑operational → Formal‑operational; driven by schemas, assimilation, accommodation. Vygotsky: Learning occurs in the Zone of Proximal Development (ZPD); scaffolding bridges ZPD. Attachment (Bowlby/Ainsworth): Secure vs insecure bonds shape later social‑emotional competence. Erikson’s psychosocial stages: each crisis (e.g., Trust vs. Mistrust, Identity vs. Role Confusion) must be resolved for healthy development. Behaviorism: Classical (Watson) & operant (Skinner) conditioning → reinforcement & punishment shape behavior. Developmental plasticity: Experience‑expectant (sensitive periods) vs. experience‑dependent change. Milestones: observable, age‑linked abilities that signal typical vs. atypical progress. Motor development patterns: cephalocaudal (head‑to‑toe) and proximodistal (center‑to‑periphery). Language domains: phonology, lexicon, morphology, syntax, semantics, pragmatics. Risk factors: malnutrition, low SES, toxic exposures (lead, arsenic, pesticides), maternal depression/substance use, neglect. --- 📌 Must Remember Object permanence → 7‑9 mo (sensorimotor). Egocentrism peaks at 3‑4 yr; diminishes by 7 yr. Reversibility & inductive reasoning appear in concrete‑operational stage (7‑12 yr). Formal‑operational (≈11 yr onward) enables abstract, hypothetical thinking. ZPD = tasks a child can do with help but not alone. Secure attachment predicts better emotion regulation & later relationships. Growth patterns: weight doubles by 4 mo, triples by 1 yr; second growth spurt 9‑15 yr. Failure to thrive = weight < age‑norm or poor weight‑gain rate. Stunted growth = chronic malnutrition → reduced height velocity. Short stature = >2 SD below mean for age/sex. Vocabulary explosion: 50‑100 new words/month in the second year. Iodine deficiency → 13.5 IQ‑point loss; lead → attention deficits. Maternal depression → lower Bayley motor & mental scores; boys more vulnerable. --- 🔄 Key Processes Piagetian adaptation Schema formation – mental structures for experience. Assimilation – fit new info into existing schemas. Accommodation – modify schemas when info doesn’t fit. Equilibration – balance assimilation & accommodation → stage shift. Vygotskian scaffolding Assess child’s current ZPD level. Provide guided assistance (modeling, prompting). Gradually fade support as competence increases. Motor milestone sequence (infancy) Head control → 2. Rolling → 3. Sitting → 4. Crawling → 5. Pull‑to‑stand → 6. Cruising → 7. Independent walking. Language acquisition flow Cooing (0‑2 mo) → 2. Babbling (≈5 mo) → 3. First words (≈12 mo) → 4. Two‑word combos (1‑2 yr) → 5. Vocabulary surge (2‑3 yr) → 6. Complex sentences (4‑6 yr). Research design selection Longitudinal → track development over time; best for causal inference but costly. Cross‑sectional → compare ages at one point; quick, but cohort effects possible. Correlational → identify relationships; cannot prove causation. --- 🔍 Key Comparisons Sensorimotor vs. Pre‑operational Sensorimotor: no mental symbols, learns through actions. Pre‑operational: uses symbols, still egocentric, lacks logical operations. Vygotsky’s ZPD vs. Piaget’s stages ZPD: social support determines what can be learned now. Stages: ontogenetic readiness determines ability, independent of support. Secure vs. Insecure attachment Secure: child seeks comfort, easily soothed, explores confidently. Insecure‑avoidant: minimal distress, avoids caregiver. Insecure‑ambivalent: intense distress, difficulty calming. Experience‑expectant vs. Experience‑dependent plasticity Expectant: universal experiences (e.g., vision) needed during sensitive periods. Dependent: unique experiences shape individual skills (e.g., musical training). Behaviorism vs. Cognitive theories Behaviorism: learning = stimulus‑response, reinforcement. Cognitive: internal mental representations, information processing. --- ⚠️ Common Misunderstandings “Piaget stages are strict age limits.” → Ages are averages; individual variation and overlap are normal. “All children acquire language at the same speed.” → Receptive language precedes expressive; cultural and environmental factors cause wide variation. “Attachment only matters in infancy.” → Early attachment patterns influence later relationships and emotional regulation. “Malnutrition only affects physical growth.” → Early nutrient deficits (iron, iodine, zinc) have lasting cognitive consequences. “Socio‑economic status only affects school performance.” → SES also impacts brain development via nutrition, stress, and stimulation. --- 🧠 Mental Models / Intuition “Nested dolls” – Think of Bronfenbrenner’s systems as Russian nesting dolls: the child is at the core, each larger doll (family, school, community, culture) shapes development. “Construction site” – Development = building a house: genetics provide the blueprint, environment supplies the materials, scaffolding (parents, teachers) keeps the structure stable while it rises. “Rubber band” – Plasticity is a stretchy band: high stretch = environment can shape outcome; low stretch = genetics dominate. --- 🚩 Exceptions & Edge Cases Horizontal decalage: a child may solve some concrete‑operational tasks earlier than others (e.g., conservation of volume before number). Asynchronous development: cognitive abilities may outpace motor or emotional skills (common in gifted children). Persistent primitive reflexes (>6 mo) can signal neurological disorder (e.g., cerebral palsy). Gender differences: early fluid reasoning advantage for girls up to age 4, then converges. Cultural variation: Milestones (e.g., walking age) can shift slightly with caregiving practices. --- 📍 When to Use Which Assessing developmental progress → use milestones for quick screening; follow with standardized tests if delay suspected. Choosing a theoretical lens → Ecological → when examining multi‑level environmental impacts. Piagetian → when focusing on logical reasoning milestones. Vygotskian → when planning instructional scaffolding. Intervention for language delay → start with parent‑mediated interaction; if no progress → refer to speech‑language therapy. Addressing nutrition‑related cognitive deficits → prioritize iron, iodine, zinc supplementation; combine with stimulating home environment. --- 👀 Patterns to Recognize “Cephalocaudal → proximodistal” in motor milestones. “Egocentric → perspective‑taking” transition around age 7. “Rapid vocabulary growth” between 18‑30 months (watch for plateau). “Sensitive periods”: vision (0‑1 yr), language (0‑3 yr), social attachment (first 2 yr). Risk‑factor clustering: poverty + poor nutrition + low stimulation → higher likelihood of cognitive delay. --- 🗂️ Exam Traps “Object permanence develops at 12 months.” – True onset is 7‑9 months; 12 mo is when most infants reliably demonstrate it. “Formal‑operational stage begins at age 10.” – Average onset is 11 yr; earlier emergence is possible with advanced education. “All children reach the same motor milestones at the same age.” – Normal variation of ±2‑3 months is acceptable; only extreme delays signal concern. “Lead exposure only affects behavior, not IQ.” – Lead reduces IQ and impairs attention; both cognitive and behavioral domains are affected. “Only genetics determine height.” – Genetics set potential, but nutrition and health determine whether potential is reached. ---