The American Academy of Pediatrics (AAP) and the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition (NASPGHAN) have issued updated clinical guidance on children with poor weight gain, recommending standardized diagnostic criteria based on growth z scores, discouraging routine diagnostic testing in the absence of concerning features, and emphasizing increased caloric intake as initial management.
In the clinical practice guideline, the term “failure to thrive” is replaced with “faltering weight” and defined using anthropometric z score thresholds with corresponding percentile cutoffs. Faltering weight includes weight-for-length or body mass index for age below −1.65 z score (approximately the fifth percentile), weight gain velocity below −2 z score (approximately the 2.3rd percentile) in children younger than 2 years, or a decline of at least 1 z score in weight or related measures.
The guideline was developed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) framework and includes eight Key Action Statements and four Good Practice Statements.
Diagnostic Testing Shows Low Yield
The guideline recommends that initial evaluation begin with a detailed history, physical examination, and assessment of feeding and developmental factors before consideration of diagnostic testing. Routine laboratory or imaging studies are not recommended in children without concerning features because of low diagnostic yield.
Across studies reviewed, diagnostic testing identified an underlying etiology in approximately 2.8% to 14% of patients, with some analyses reporting yields as low as 0.8% to 6.8%. The guideline supports targeted testing in children with persistent faltering weight or concerning clinical features.
Endoscopy Not Recommended for Initial Evaluation
The guideline recommends against endoscopy as part of the initial evaluation, citing low diagnostic yield and potential risks.
In studies reviewed, abnormal endoscopic findings varied widely, ranging from none in some cohorts to as high as 94%, with one analysis reporting that approximately 20% of children had visual or histologic abnormalities. Procedure-related grade 2 adverse events occurred in 1.2% of cases, and anesthesia-related complications occurred in 4.8%, based on indirect evidence.
Endoscopy with biopsy is suggested in children with persistent faltering weight or when specific gastrointestinal conditions are suspected.
Guideline Suggests Against Using Socioeconomic Status as a Diagnostic Risk Factor
The guideline suggests against using socioeconomic status as a diagnostic risk factor for faltering weight, citing inconsistent findings across observational studies. Most studies reviewed found little to no association between socioeconomic measures and faltering weight, although one study reported higher rates among children in the lowest household income quartile.
The researchers emphasize that social drivers of health remain important considerations in patient care and support.
Nutritional Interventions Central to Management
Nutritional intervention is central to management. The guideline recommends increasing caloric intake to improve growth outcomes.
In one cohort study of 160 children reviewed by the guideline, multidisciplinary programs were associated with greater weight gain compared with standard care, with a mean difference of 0.57 in growth measures.
Oral nutritional supplementation is suggested, with studies reporting increased weight gain of 17.8 g per day and higher energy intake of 121 kJ per kilogram per day compared with standard formula. A randomized trial reported a 0.1 kg increase in body weight among children receiving supplementation.
Feeding therapy is suggested for children with feeding difficulties. Randomized trials showed modest improvements in weight and height, with additional gains in cognitive and motor outcomes in home-based programs.
Co-Occurring Conditions Common
The guideline highlights co-occurring conditions reported in children with faltering weight, including gastrointestinal, pulmonary, neurologic, and congenital disorders. These conditions should be considered based on findings from the history and physical examination rather than identified through routine screening tests.
Evidence Limitations and Implementation
The guideline is based on systematic reviews of studies in children aged 0 to 5 years living in high-income countries, including retrospective and prospective cohorts and randomized trials.
Diagnostic criteria were developed using a modified Delphi process requiring 80% consensus. One criterion—a decline of at least 1 z score—was included despite not reaching the predefined consensus threshold, with 78.5% agreement among panelists.
The guideline notes that implementation will require accurate anthropometric measurement, multidisciplinary care, and integration of z scores into electronic health records.
“[T]he practice of medicine dictates tailoring care to individual patients and families,” wrote Hans B. Kersten, MD, of St. Christopher’s Hospital for Children at Drexel University College of Medicine, and colleagues.
Full disclosures can be found in the published guidelines.
Source: Pediatrics
