In plain words
The Newborn Weight Tool places a baby's weight on the expected curve for the hour of life. It is based on the early weight-loss research from Flaherman and colleagues. Care teams and some parents use it to see whether weight loss is within the usual range. Entering a weight and a time gives a percentile. The result is a prompt for a conversation, not a diagnosis. It works best with accurate weights taken on the same scale. If the result is low, or the baby seems unwell, talk to your pediatrician or the same day.
The deeper version
The Newborn Weight Tool operationalizes the Flaherman percentiles of early weight loss in exclusively breastfed infants, providing expected weight-for-hour-of-life curves against which clinicians classify weight loss. Its precision depends on accurate birth weight and scale calibration, and classification is only as sound as the cohort the norms came from. The tool does not measure feeding adequacy directly. ABM Clinical Protocol #3 discusses weight-loss thresholds that trigger closer evaluation and a feeding assessment. The controversy concerns whether early-loss curves generalize to formula-fed, mixed-fed, and diverse infant populations, since the derivation cohorts were restricted to exclusively breastfed infants.
Where it comes up
- Is my baby getting enough?Feeding Your Baby
- Newborn weight: the early drop and regainingBaby Basics
- Pediatrician visits in the first weeksBaby Basics
What mothers here say about Newborn Weight Tool
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Sources
- Flaherman VJ and colleagues — Early weight loss nomograms for exclusively breastfed newborns, Pediatrics (2015)
- Academy of Breastfeeding Medicine — Clinical Protocol #3: Hospital Guidelines for the Use of Supplementary Feedings in the Healthy Term Breastfed Neonate