According to specialized healthcare writer Myrrh Hector from LoveToKnow, there is no official information on the world's biggest pregnant belly. The size of a pregnant belly depends on the number of babies; sextuplets, septuplets and octuplets are a result of in vitro fertilization.
Mayo Clinic experts explain that in vitro fertilization results in a high number of embryos. If more than one embryo is implanted into the uterus, multiple fetuses develop, leading to a bigger pregnancy belly.
Hector reports that several women have vied for title of the biggest pregnant belly: Nkem Chukwu with her octuplets from 1998, Bobby McCaughey with her septuplets from 1997, Kate Gosselin with her sextuplets from 2004 and Nadya Suleman with her octuplets from 2009.