Initial assessment
When a child is identified as having growth that appears lower than expected for age, this represents a relatively common situation in clinical practice, but one that requires a systematic and careful approach. Although most cases correspond to normal variants of growth, such as familial short stature or constitutional delay of growth and puberty, it is essential to recognise early those situations that may reflect underlying disease. Assessment should not be based solely on isolated height measurement, but mainly on the longitudinal growth pattern and its integration with the child’s overall clinical context.
The first step is always to confirm reliable measurements and analyse growth longitudinally. A single measurement rarely allows safe conclusions; instead, growth velocity over time provides the most relevant information. Comparison with growth charts appropriate for age and sex, as well as estimation of the familial genetic potential through target height, helps distinguish children who are growing within their expected growth channel from those who progressively deviate from that potential.
Physiological variants of growth
When height is within acceptable limits and growth velocity is appropriate, most situations correspond to benign variants. In these cases, bone age is a particularly useful element, as it helps assess the pace of biological maturation. A bone age consistent with chronological age suggests familial short stature, whereas delayed bone age, associated with preserved growth velocity, is typical of constitutional delay of growth and puberty.
In these scenarios, management is mainly based on periodic monitoring and follow-up of the growth pattern, since final height tends to be appropriate for the child’s genetic potential.
Suspicion of pathological aetiology
By contrast, the presence of deceleration in growth velocity, a significant discrepancy from genetic potential or associated clinical signs should always raise suspicion of a pathological aetiology. In these situations, assessment should integrate bone age and targeted laboratory investigation, aiming to identify endocrine, systemic or nutritional causes.
Specific laboratory abnormalities, such as thyroid dysfunction, elevated inflammatory markers, signs of malabsorption or impairment of the growth hormone axis, guide further investigation and support an aetiological diagnosis.
Assessment of body proportionality
When no evident systemic cause is identified, assessment of body proportionality becomes particularly important. Analysis of the relationships between body segments helps distinguish proportional from disproportionate short stature. Significant disproportion suggests skeletal disease or genetic syndromes, situations that require targeted investigation and specialist referral.
On the other hand, when proportionality is preserved, integration of nutritional status, the presence of dysmorphic features or a history of intrauterine growth restriction helps guide the diagnostic hypothesis and define the need for follow-up or intervention.
Reassessment and follow-up
Throughout the process, periodic clinical reassessment remains essential. Growth is a dynamic phenomenon, and its evolution over time is often the most informative element. Regular monitoring of growth velocity, combined with review of the clinical and family context, makes it possible to confirm benign patterns or identify early warning signs that justify further investigation.
In summary, interpretation of this approach is based on a sequential and integrative logic: confirm the quality of measurements, assess growth velocity and genetic potential, distinguish normal maturation from biological delay, exclude systemic causes and finally analyse body proportionality. This structure allows a frequent concern to be transformed into an objective and rational assessment, facilitating early identification of relevant pathology while avoiding unnecessary investigation in benign situations.
