Multiple births occur when a woman gives birth to more than one baby at the same time. This can happen with twins, triplets, or even higher-order multiples. The most common type is twins, which can be either identical (monozygotic) or fraternal (dizygotic). Identical twins come from a single fertilized egg that splits, while fraternal twins develop from two separate eggs. The likelihood of multiple births can be influenced by factors such as family history, maternal age, and fertility treatments. Advances in reproductive technology, like in vitro fertilization (IVF), have also increased the occurrence of multiple births. These pregnancies often require special medical care to ensure the health of both the mother and the babies.