Patient's question:
NoDoctor's answer:
Twins refer to the situation where a placental animal gives birth to two individuals in one pregnancy. Twins are generally divided into two categories: identical twins and fraternal twins. Identical twins are formed when two fetuses develop from a single fertilized egg, while fraternal twins are formed from different fertilized eggs. In human society, the global average birth rate for twins is 1:89. (This means that, on average, out of every 89 pregnant women, one will give birth to twins.)