Twins for two fetuses are some names for this. Quintuplets for five fetuses Six fetuses in a sextuplet. Seven fetuses in an octet. Eight fetuses in a ennead. Names for multiple births. The more common names for multiple births are twins, doublets, triplets, and so on. A set of five babies is called a quintuplet. A set of eight babies is called an octet. A set of 11 babies is called a ennead. There are many ways to say the same thing with different words. Language is flexible that way. For example, you can say "this is a pair of shoes" or "these are pairs of shoes." Both sentences are correct, but they mean different things. "Pairs of shoes" means a set of two shoes that match together. "This is a pair of shoes" means that these are the only two shoes of their kind that I know about. There may be others somewhere else, but I haven't seen them yet. Words change their meaning over time. This is why scientists need to publish their findings before other people do. If someone publishes a study saying something new before they do, then they get the credit for it.