CPN Certified Pediatric Nurse Exam

Growth refers to quantitative physical changes including increases in height, weight, and organ size. Development describes qualitative changes in functional capacity, skills, and abilities. These processes occur simultaneously but at different rates. Growth follows predictable patterns: cephalocaudal (head to toe), proximodistal (center to periphery), and general to specific. Individual variation exists within normal ranges, influenced by genetics, environment, nutrition, and health status.

Critical periods represent windows when specific developmental tasks must occur for optimal outcomes. Sensitive periods indicate times of heightened responsiveness to environmental influences. Developmental milestones serve as markers for expected achievements at certain ages, though ranges accommodate normal variation.

Cognitive development refers to how children use cognitive abilities to understand and interact with their environment. Jean Piaget identified four major stages: sensorimotor (birth to 2 years), preoperational (2 to 7 years), concrete operational (7 to 11 years), and formal operational (11 years and beyond).

During the sensorimotor stage, infants learn through sensory experiences and motor actions. Object permanence develops around 8 to 12 months, representing understanding that objects exist even when not visible. Cause-and-effect relationships emerge as infants learn their actions produce results.

Preoperational thinking involves symbolic representation and language development. Children demonstrate egocentrism, difficulty understanding perspectives other than their own. Animism attributes life to inanimate objects. Centration focuses on one aspect of a situation while ignoring others. Conservation understanding remains absent.

Concrete operational thinking allows logical reasoning about tangible objects. Children master conservation, reversibility, and classification. They understand relationships and can organize information systematically but struggle with abstract concepts.

Formal operational thinking enables abstract reasoning, hypothetical thinking, and systematic problem-solving. Adolescents develop metacognition and can consider multiple possibilities simultaneously.

Erik Erikson proposed eight stages of psychosocial development, each presenting a crisis requiring resolution. Trust versus mistrust occurs during infancy (birth to 1 year). Consistent, responsive caregiving promotes trust; neglect or inconsistency leads to mistrust. Nurses support this stage by encouraging parental bonding, skin-to-skin contact, and prompt response to infant needs.

Language development follows predictable patterns. Receptive language (understanding) precedes expressive language (production). Cooing appears around 2 months, babbling by 6 months. First words emerge between 10 and 14 months. Vocabulary expands rapidly after 18 months, with two-word phrases appearing around 24 months.

By age 3, children speak in sentences and are understood by unfamiliar listeners approximately 75% of the time. Four-year-olds use complex sentences and are nearly fully intelligible. School-age children refine grammar, expand vocabulary, and develop literacy skills. Adolescents master abstract language and sophisticated communication.

Red flags for language delay include no babbling by 12 months, no single words by 16 months, no two-word phrases by 24 months, and loss of previously acquired skills at any age.

Gross motor development proceeds cephalocaudally. Head control establishes by 4 months. Sitting without support occurs around 6 months. Crawling emerges between 7 and 10 months. Independent walking typically occurs between 12 and 15 months. Running, climbing, and jumping develop throughout toddlerhood. School-age children refine coordination for sports and complex physical activities.

Fine motor development follows proximodistal patterns. Reflexive grasp transitions to voluntary reaching by 4 months. Palmar grasp appears around 5 months, progressing to pincer grasp by 9 to 10 months. Toddlers scribble and stack blocks. Preschoolers draw shapes, cut with scissors, and dress independently. School-age children develop handwriting proficiency and manipulate small objects skillfully.

Newborns demonstrate reflexive behaviors including rooting, sucking, Moro, grasp, and stepping reflexes. These primitive reflexes disappear as voluntary motor control develops. Vision progresses from focusing at 8 to 12 inches to full visual acuity by 6 months.

Social smiling appears around 6 to 8 weeks. Stranger anxiety develops between 6 and 8 months, indicating attachment formation. Separation anxiety peaks around 9 to 18 months. Infants communicate through crying, facial expressions, gestures, and vocalizations.

Weight typically doubles by 5 months and triples by 12 months. Length increases approximately 50% during the first year. Head circumference reflects brain growth and should be measured at each well visit.

Toddlers gain approximately 5 pounds and grow 3 inches annually. Physiologic anorexia reflects slowed growth rate; decreased appetite is normal. Anterior fontanel closes between 12 and 18 months.

Gross motor achievements include walking independently, running, climbing stairs, and kicking balls. Fine motor skills allow stacking blocks, turning pages, and using utensils. Toilet training readiness typically emerges between 18 and 24 months, requiring physical, cognitive, and emotional maturity.

Toddlers demonstrate autonomy through negativism ("no"), ritualistic behavior, and parallel play. Temper tantrums represent normal developmental expressions of frustration. Language explodes from single words to sentences during this period.

Preschoolers grow approximately 2.5 inches and gain 5 pounds annually. Body proportions shift; the characteristic toddler potbelly disappears. Physical coordination improves dramatically.

Imaginative play dominates preschool years. Children engage in associative and cooperative play. Fantasy and reality boundaries blur; magical thinking prevails. Imaginary friends are developmentally normal. Fears of darkness, monsters, and bodily harm are common.

Preschoolers demonstrate increasing independence in self-care. They dress and undress, brush teeth with assistance, and use the toilet independently. Drawing progresses from circles to recognizable human figures.

School-age children grow approximately 2 inches and gain 5 to 7 pounds annually. Growth occurs in spurts rather than steadily. Permanent teeth erupt, beginning around age 6.

Cognitive abilities expand dramatically. Concrete operational thinking enables logical problem-solving. Academic skills develop rapidly. Children understand rules, fairness, and reciprocity. Same-gender friendships predominate; peer relationships gain importance.

Industry develops through accomplishments in school, sports, and hobbies. Self-concept reflects perceptions of competence. Body image awareness increases, particularly approaching puberty. Privacy concerns emerge.

Puberty involves hormonal changes producing secondary sexual characteristics and reproductive capability. Girls typically enter puberty 2 years earlier than boys. Tanner staging describes pubertal progression through five stages.

Female pubertal changes include breast development (thelarche), pubic hair growth (pubarche), growth spurt, and menarche. Average age of menarche is 12.5 years, typically occurring 2 to 3 years after breast budding.

Male pubertal changes begin with testicular enlargement, followed by penile growth, pubic hair, growth spurt, voice changes, and facial hair. Spermarche occurs around age 13.

Adolescents experience intense emotional variability related to hormonal fluctuations and psychosocial development. Risk-taking behavior reflects incomplete prefrontal cortex maturation. Abstract thinking enables philosophical and moral reasoning but also contributes to personal fable (sense of invulnerability) and imaginary audience (belief others constantly observe them).