The mystery of twin formation Twins refer to babies born when two or more embryos produced in the mother\’s body develop and grow at the same time during the same pregnancy. Compared with single babies, twins are more mysterious and precious. So, how are twins formed? The following is an introduction to the mystery of twin formation from four aspects. 1. Formation of natural twins When a woman ovulates, two eggs may be released from the ovary. If the double arrows are very close together, one sperm will fertilize two eggs in a short period of time, and twins will form. since