Practice question

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A 5-day-old breastfed baby is reviewed and noted to be jaundiced. Birth weight was 3.5 kg, and today's weight is 3.2 kg (approx 8.5% weight loss). The baby is feeding well, passing pale stools, and has dark urine. Examination reveals jaundice down to the chest. What is the most appropriate next step according to NICE guidelines?

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