Multiple pregnancies occur when a woman carries more than one fetus at the same time. This can happen with twins, triplets, or even higher-order multiples. The most common type is fraternal twins, which result from two separate eggs being fertilized. Identical twins occur when a single fertilized egg splits into two embryos. The likelihood of multiple pregnancies can be influenced by factors such as family history, maternal age, and the use of fertility treatments. Multiple pregnancies often require closer monitoring by healthcare providers to ensure the health and safety of both the mother and the babies.