A Weight Estimation Strategy for Preterm and Full-Term Infants

• Main Authors: Susan M. Abdel-Rahman PharmD, Ian M. Paul MD, Paula Delmore RN, Laura James MD, Laura Fearn RN, Andrew Atz MD, Brenda Poindexter MD, Amira Al-Uzri MD, Andrew Lewandowski PhD, Barrie Harper, P. Brian Smith MD
• Format: Article
• Language: English
• Published: SAGE Publishing 2017-12-01
• Series: Global Pediatric Health
• Online Access: https://doi.org/10.1177/2333794X17748775

Weight is the foremost marker of health outcomes in infants; however, the majority of community workers and health care providers in remote, resource-constrained settings have limited access to functional scales. This study develops and validates a simple weight estimation strategy for infants that addresses the limitations of current approaches. Circumferential and segmental anthropometric measures were evaluated for their relationship to infant weight and length. Data derived from 2097 US infants (n = 1681 for model development, n = 416 for validation). Statistical and practical considerations informed final measurement selection. Head circumference and chest circumference demonstrated the best correlations with weight ( r = 0.89) and length ( r = 0.94 and 0.93), and were among the most reproducible as reflected by intraclass correlation coefficients (>0.98). The head circumference and chest circumference combination offered better goodness-of-fit and smaller limits of agreement than did either measure alone. The final model predicted weight within 10% and 15% of actual for 84% and 94% of infants, respectively, with no bias for postnatal age ( P = .76), gestational age ( P = .10), and sex ( P = .25). The model requires simple summation to generate a weight estimate and can be embodied as a low-cost, paper-based device.