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"It's called superfetation - it has a medical term to it, so why this process is not explained to surrogates, I don't know. They don't give this as a possibility."

The difference in their size was obvious in the first trimester of pregnancy and continued, leading the doctor to offer superfetation as a diagnosis.

A rare condition known as superfetation makes it possible to conceive for a second time when pregnant.

For that which is denied in other generations is done in this of yours: for here is superfetation, childe upon childe, and that which is more strange twins at a latter conception.

Again: he is charged, as above, with adding to his apparent perfidy a superfetation of insolence, an accretion or excrescence of insult.