Amniotic fluid contains fetal urine {from swallowed amniotic fluid} and occasionally meconium: baby's first feces, composed of mucus, bile, epithelial cells, shed fetal hair, and other amniotic detritus. The Wikipedia entry helpfully contrasts the tarry, olive-brown smear of meconium-photographed in a tiny disposable diaper-with the similarly posed yellowish excretion of a breast-fed newborn, both with an option for viewing in the magnified resolution of 1,280 × 528 pixels.
( Mary Roach )
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