Thin abdominal wall, severe intra-abdominal soiling, and polymicrobial infection accounted for the inflammatory process spreading to the skin of the umbilicus.

• 我们认为严重的腹腔内感染和幼童腹壁薄弱，导致发炎反应易扩散至肚脐，是造成肚脐发红的原因。