Superfetation, the occurrence of multiple gestations with separate implantation times, can be influenced by several factors. One such factor is the use of assisted reproductive technologies (ART) such as in vitro fertilization (IVF). In cases where a woman undergoes IVF and continues to ovulate after the initial embryo transfer, there is a potential for superfetation to occur, leading to the development of a second embryo.

Another factor that could increase the likelihood of superfetation is hormonal irregularities. Hormonal imbalances or irregularities in the menstrual cycle can create conditions conducive to the release of multiple eggs during different ovulatory cycles, thus increasing the potential for superfetation.

Additionally, certain medical conditions such as polycystic ovary syndrome (PCOS) can contribute to irregular ovulation, potentially leading to the occurrence of superfetation.

It's important to note that superfetation is a rare phenomenon in humans, and while these factors may increase the likelihood, the occurrence of superfetation remains uncommon.