A British mother gave birth on the same day to two babies conceived a month apart. This is a so-called superfetal pregnancy, which characterizes a pregnant woman a second time during her pregnancy.
Only a dozen cases have been studied scientifically to date in the world. A superfetatory pregnancy can only be diagnosed before childbirth under two conditions: ultrasounds must be able to prove that a second baby appeared later, and the growth lag must be constant until birth. In this case, ovulation continues while it is interrupted during a classic pregnancy.