During a home visit on day 7, a lactation consultant finds the infant has not regained birth weight. The mother reports feeding 8–10 times per day. What is the most important next assessment step?
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A
Order a serum bilirubin test
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B
Perform a pre- and post-feed weight with a calibrated scale
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C
Recommend immediate formula supplementation
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D
Refer to a speech-language pathologist