Weight gain monitoring in a breastfed neonate: A baby weighing 3200 g at birth has lost 6.5% of birth weight by day 3. By day 7 the weight is still 100 g below birth weight. The mother reports difficulty latching. What is the maximum acceptable weight loss for a breastfed neonate, and when should birth weight be fully regained?

• A Maximum 7% loss acceptable; birth weight regained by day 7
• B Maximum 5% loss acceptable; birth weight regained by day 5
• C Any weight loss beyond 3% requires formula supplementation immediately
• D Maximum 10% loss acceptable; birth weight regained by day 10–14 ✓

Explanation

Physiological weight loss in a term breastfed neonate: up to 7–10% of birth weight loss in the first 3–4 days is considered acceptable (with 10% being the upper limit — above which evaluation for dehydration/inadequate feeding is mandatory). Birth weight should be fully regained by day 10 (and ideally by day 14 at the latest). After regaining birth weight, normal gain is 15–30 g/day in the first 3 months. The infant described has lost 6.5% (within normal) but has not regained birth weight by day 7 with breastfeeding difficulty — this warrants lactation support, assessment of feeding, and close monitoring, but does not yet mandate supplementation if feeding can be optimized.

Reference: Ghai Essential Pediatrics, 10th ed.

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Written and medically reviewed by the StethoPrep medical team.