Twins, triplets and multiple births occur with to varying degrees in most animal species, although the term is most applicable to species in the Placentalia subclass. A multiple birth, for human beings, results when more than one human baby is born from a single pregnancy. Multiple birth - Classification. The most common form of human multiple birth is twins (two babies), but cases of triplets (three), quadruplets (four), quintuplets (five), sextuplets (six), septuplets (seven), and octuplets (eight) have a ...

Including:

• Multiple birth - Classification
• Multiple birth - Human multiple births
• Multiple birth - Causes and frequency
• Multiple birth - Risks
• Multiple birth - Cultural aspects
• Multiple birth - List of famous multiple births
• Multiple birth - Fictional multiple births

Read more here: » Multiple birth: Encyclopedia - Multiple birth

Multiple birth - Causes and frequency. Human multiple births can occur either naturally (the woman ovulates multiple eggs or the fertilized egg splits into two) or as the result of infertility treatments (several embryos are usually implanted to compensate for their lower viability). In general, twins occur naturally at approximately the rate of 1/89 of singleton births, triplets at 1/89 the rate of twin births, and so on (Hellin's Law). However, for reasons that are unknown, the older a woman is, th ...

See also:

Multiple birth, Multiple birth - Classification, Multiple birth - Human multiple births, Multiple birth - Causes and frequency, Multiple birth - Risks, Multiple birth - Cultural aspects, Multiple birth - List of famous multiple births, Multiple birth - Fictional multiple births

Read more here: » Multiple birth: Encyclopedia II - Multiple birth - Human multiple births

The most common form of human multiple birth is twins (two babies), but cases of triplets (three), quadruplets (four), quintuplets (five), sextuplets (six), septuplets (seven), and octuplets (eight) have all been recorded with all siblings being born alive. The largest set in which all members survived more than a few days is septuplets, the first of which was in 1997. There have been a few sets of nonuplets (nine) in which a few babies were born alive, and there have been pregnancies — but no known instances of live births — of decaplet ...

See also:

Multiple birth, Multiple birth - Classification, Multiple birth - Human multiple births, Multiple birth - Causes and frequency, Multiple birth - Risks, Multiple birth - Cultural aspects, Multiple birth - List of famous multiple births, Multiple birth - Fictional multiple births

Read more here: » Multiple birth: Encyclopedia II - Multiple birth - Classification