Growth Faltering vs Failure to Thrive: Terminology and Clinical Distinction
Growth faltering and failure to thrive are the same clinical entity—growth faltering is simply the modern, preferred terminology that has replaced the older term "failure to thrive." 1, 2, 3
Evolution of Terminology
- Growth faltering is the current accepted term, having replaced "failure to thrive" in contemporary medical practice 1, 2
- The term is also referred to as "pediatric malnutrition" or "weight faltering" in some contexts 2
- This terminology shift reflects a move away from language that could be perceived as judgmental toward caregivers 1
Clinical Definition
Both terms describe the same condition: children who do not reach their expected weight, length, or body mass index for age. 1
Diagnostic Criteria
- Traditional criteria included weight below the 3rd or 5th percentile, or crossing two major percentile lines downward 1, 4
- Modern approach now emphasizes anthropometric z-scores, which can be calculated from a single set of measurements to assess malnutrition severity more precisely 1
- Growth is assessed using:
Key Clinical Features
- Weight faltering occurs first, followed by impaired height and head circumference if undernutrition persists 4
- The condition represents a slower rate of weight gain than expected for age and sex 3
- Sustained undernutrition can impede cognitive development and immune function in severe cases 4
Common Pitfalls
- Inadequate caloric intake is the most common cause in both developed and developing countries, not organic disease 1, 2, 5
- Normal growth variants (catch-down growth, constitutional growth delay, familial short stature) should not be confused with true growth faltering 5
- Premature infants with appropriate growth velocity do not require further evaluation 5
Critical Timing Considerations
Failure to recognize and treat growth faltering in the first two years of life may result in decreased adult height and cognitive potential. 1 This underscores why early identification using the modern term "growth faltering" with precise z-score measurements is essential for timely intervention 1, 6