If you have already had a set of natural fraternal twins or multiples, then your chances of having another set of fraternal twins or multiples has greatly increased!
Chance of having fraternal natural twins is about 1 in 90.
Chance of having fraternal twins with fertility drugs is about 1 in 35.
Chance of having identical twins is about 1 in 250.
Chance of having triplets is about 1 in 8,100.
Second time around:
If your first set of twins were fraternal, then your chances of having another set of fraternal twins is multiplied by four! That's 1 in 12!
If your first set of twins were identical, then your chances of having another set of identical twins drops way down to 1 in 70,000 or so.
at 1:52 AM on Oct. 23, 2010