A woman might ovulate twice in the same cycle, something that’s more common after the age of 35. The result, as you might imagine, leads to the formation of two beautiful little babies in your arms after nine months.

Even more rarely, the ovary might release three or even four eggs at a time, ultimately leading to the birth of triplets or quadruplets – it happens with more frequency after treatments for ovulation induction and In Vitro Fertilization (IVF). There are very few registered cases of quintuplets, sextuplets and septuplets (also called super twins) pregnancies that happen naturally. 

If two eggs are released by the ovaries and fertilized by two different sperm cells, it’ll generate non-identical twins. However, after being fertilized, one egg can divide into two resulting in identical twins, with the same set of chromosomes.