A 32-year-old mother presents with her 4-week-old infant, who is exclusively breastfed
A 32-year-old mother presents with her 4-week-old infant, who is exclusively breastfed. She is concerned that the infant isn’t gaining enough weight. The infant’s weight is on the 2nd centile, having been born on the 50th centile.
What is the most appropriate first-line investigation?
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