You are examining a newborn in the delivery room. He was born at full term by spontaneous vaginal delivery. On examination, he is active, and his vital signs are within normal range. His head circumference is at the third percentile, with height and weight at the 10th percentile. Auscultation of his chest is clear with normal cardiovascular examination findings. The abdomen is protuberant with a liver edge palpable at 4 cm below the costal margin and mild splenomegaly. Which one of the following is the most likely diagnosis?
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