PE1.1 | Growth Terminology and Determinants — Summary & Reflection

KEY TAKEAWAYS

Growth is a quantitative increase in physical dimensions, measured as weight, length/height, and head circumference. Development is a qualitative gain in functional capacity, assessed by milestone attainment. Velocity (rate of change over time) is more sensitive for detecting growth problems than distance (attained size at one time point). Catch-up growth occurs after a growth-limiting factor is removed, provided nutritional support is adequate.

Normal growth landmarks: birth weight doubles by 5 months, triples by 12 months; birth length (~50 cm) increases by ~25 cm in year 1; head circumference equals chest circumference at ~1 year.

Growth determinants are genetic (familial stature, constitutional tempo) and environmental (nutrition, illness, psychosocial stimulation, SES, hormonal—GH/IGF-1 as the dominant postnatal axis, thyroid as permissive, sex steroids for the pubertal spurt, glucocorticoids as catabolic at excess doses). In India, nutritional deficits and infection remain the leading environmental constraints on child growth, with ~35% stunting in under-5s (NFHS-5).

REFLECT

Think about the last child health visit you have observed or participated in. Was growth monitoring performed? Was the result interpreted in the context of the child's specific determinants—family history, nutritional intake, recent illness history? Reflecting on Kolb's cycle: what concrete experience have you had (or might you soon have) of a child with growth faltering? What conceptual model from this module would you apply to that observation? How would you test your understanding in the next outpatient paediatrics posting by deliberately asking about growth velocity and determinants for every child under two?