A percentage of of 3% is the chance of a couple to conceive twin babies. But there is a better way of increasing this percentage by doing these things.
First, what you need to do is to know that your chances of having a twins is small. But their are certain things that could help increase it.
If there had been cases of twins either in the mother side or father side. Tall, slightly overweight and nourished people have better chances.
It is also important that the health of the woman is good. Supplements and pregnancy folic acid should be taken.
Be sure to take in a lots of dairy and yams to have a higher chance.
Before taking in any alternative methods, be sure to always consult your OB/GYNE to make sure that everything is going to be fine.