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连体婴是一种极为罕见的妊娠现象,它是由单独的一个受精卵分裂而成。与正常的单卵双胞胎妊娠过程不同的是,受精卵在最初两星期内没能完全分离,局部分离的受精卵继续成熟,结果便形成了一个连体的胎儿。
Siamese twins is an extremely rare pregnancy characterized by the division of a single fertilized egg. Unlike normal monozygotic twin pregnancies, fertilized eggs do not completely separate within the first two weeks and partially separated fertilized eggs continue to mature, resulting in the formation of a conjoined fetus.