4.1 Growth & Development Across the Lifespan

Growth and Development Across the Lifespan

Health promotion begins with knowing what is normal at each age. On the CPNRE (Canadian Practical Nurse Registration Examination) and REx-PN (Regulatory Exam - Practical Nurse), Health Promotion and Maintenance carries 6-12% of items, and many of them ask you to separate an expected developmental finding from a red flag, or to pick age-appropriate anticipatory guidance. You cannot teach a parent, screen for delay, or reassure an older adult without a working map of two distinct ideas. Growth is measurable physical change (height, weight, head circumference). Development is the progressive gain of function and skill. Both proceed cephalocaudal (head-to-toe) and proximodistal (centre-to-periphery), so an infant controls the head before the trunk, and the trunk before the fingers.

Two theories the exam loves

Erik Erikson describes eight psychosocial stages, each a developmental crisis the person must resolve. A question may give a client's age and ask which task is central to their care.

Jean Piaget describes four cognitive stages: sensorimotor (birth-2 yr, learns through senses, develops object permanence), preoperational (2-7 yr, egocentric, magical thinking, cannot yet grasp conservation), concrete operational (7-11 yr, logical about concrete objects, understands conservation and cause-effect), and formal operational (11 yr and up, abstract and hypothetical reasoning). This matters for teaching: a preschooler fears bodily harm and needs simple, concrete words and a comfort object, whereas a school-age child benefits from explanation and choices.

Milestones you must recognize

Expect these average milestones; the exam rewards knowing the ceiling age at which absence is a concern.

• 2 months: social smile, follows objects to midline, lifts head when prone.
• 6 months: rolls both ways, sits with support, transfers objects, babbles.
• 9 months: sits unsupported, crawls, pulls to stand, stranger anxiety appears.
• 12 months: pulls to stand and cruises, may take first steps, says 1-2 words, pincer grasp; birth weight has roughly tripled.
• 18 months: walks well, 10-word vocabulary, uses a spoon.
• 2 years: runs, two-word phrases, follows simple commands.
• 3 years: rides a tricycle, speaks in short sentences, toilet-trained by day.
• 4-5 years: hops and skips on alternating feet, draws a person, counts.

Red flags versus expected findings

The most common trap presents an advanced skill as if it belonged to a younger child (e.g., a 12-month-old who "should" skip or ride a tricycle - those are 4- and 3-year skills). Genuine warning signs that require referral include no social smile by 2-3 months, not sitting unsupported by 9 months, not walking by 18 months, no single words by 16 months, and no two-word phrases by 24 months. The single most important rule: loss of a previously acquired skill (regression) is always abnormal at any age and must be reported promptly, because it can signal a neurological or metabolic problem.

Anticipatory guidance

Anticipatory guidance is proactive teaching about what comes next so families can prepare and stay safe. It is matched to the child's stage: teach choking-hazard and outlet safety before an infant begins to crawl, discuss rear-facing car seats in infancy, prepare parents for stranger anxiety at 9 months and negativism ("no") in toddlerhood, and address peer pressure and risk-taking with adolescents. Good anticipatory guidance is a leading example of primary prevention delivered through the developmental lens.

The lifespan does not stop at 18

Older-adult questions are frequent. Expected aging changes include slower reaction and processing time, reduced near vision (presbyopia), high-frequency hearing loss, thinner skin, decreased thirst sensation (raising dehydration risk), and reduced renal and hepatic drug clearance. What is NOT normal aging - and therefore always investigated - is acute confusion or delirium, depression, significant memory loss that disrupts daily function, and incontinence. Framing these correctly lets the practical nurse promote independence rather than mistakenly "accept" a treatable problem as inevitable, which is the classic distractor the CPNRE and REx-PN test.

Turning theory into age-appropriate assessment

Developmental stage dictates how you assess and communicate, and the exam rewards matching your technique to the age. For an infant, perform the least distressing parts of the exam first and save invasive steps for last, keep the caregiver present, and use a warm, quiet approach. For a toddler or preschooler, allow a comfort object, offer limited choices ("which arm?"), use play and simple concrete words, and expect that fear of bodily harm and separation drives behaviour. For a school-age child, explain equipment, respect modesty, and allow participation to reinforce industry. For an adolescent, provide privacy, interview them without the parent for part of the visit, respect confidentiality within legal limits, and address identity and risk-taking. A frequent trap is offering a preschooler a long, abstract rationale or expecting an infant to "cooperate": both ignore the cognitive stage. Anticipatory guidance likewise shifts with age - poison and stair safety for a new walker, screen-time and nutrition for school-age children, and substance-use and mental-health conversations for teens - so every teaching plan is anchored to where the person actually is on the developmental map.