Inspect the breasts. The breasts of both male and female newborns are enlarged. A milky discharge from the nipple, known as witch's milk, may be present. This is the effect of maternal estrogen and is present for 1 to 2 weeks after birth.
Supernumerary nipples may be present along the milk line. They may or may not have areolae. They are often mistaken for congenital nevi and have no clinical significance. (See Fig. 16-5.)
Asymmetry of the chest wall may be a normal variant or may represent hypoplasia of the pectoralis minor and major muscles. The latter condition, when associated with deficiency of the ipsilateral hand, may be part of the Poland malformation sequence.
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