A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more … See more

Terms used for the number of offspring in a multiple birth, where a number higher than three ends with the suffix -uplet:
• two offspring – twins
• three offspring – triplets… See more

In humans, the average length of pregnancy (2 weeks fewer than gestation) is 38 weeks with a single fetus. This average decreases for each additional fetus: to 36 weeks for twin births, 32 weeks for triplets, and 30 wee… See more

The frequency of N multiple births from natural pregnancies has been given as approximately 1:89 (Hellin's law) and as about 1:80 . This gives:
• 1:89 (= 1.1%) or 1:80 (= 1.25%) for twins
• 1:89 (= 1:7… See more

Babies born from multiple-birth pregnancies are much more likely to result in premature birth than those from single pregnancies. 51% of twins and 91% of triplets are born preterm, compared to 9.4% in singletons. 14% of twin… See more

Bed rest has not been found to change outcomes and therefore is not generally recommended outside of a research study.
Selective reduction is the practice of reducing the number of fetuses in a multiple pregnancy… See more