Twins can happen naturally when one fertilized egg splits into two identical embryos
Twins can happen naturally when two separate eggs are fertilized by two separate sperm
Family history can increase the chance of fraternal twins
Older maternal age can increase the chance of twins
Fertility treatments can increase the chance of twins
Ovulation-inducing medications can increase the chance of twins
In vitro fertilization can increase the chance of twins
A healthcare professional can discuss fertility options and twin-related risks
A healthy pregnancy plan and prenatal care are important for any multiple pregnancy