If you're trying to have twins in Bitlife, most of the time it's left to RNG because there's no way to increase your chances of having twins via a normal in-game pregnancy.
That being said, there is of course a better and surefire way to have twins, and that is through the business of IVF and artificial insemination. You can find both activities in the fertility tab of Bitlife.
However, you will need to be a female character to use the artificial insemination option. But on the other hand, IVF option can be selected by both male and female characters, but you will be rejected if you are 50 years old.
Related: How to Go to Nursing School in Bitlife
Using both IVF and artificial insemination will also have a higher chance of having twins. That's why we recommend using the option at least once a year until this happens. You can also reset your results if they are unfavorable by closing the game app on your phone and then restarting it.
The trick to doing this is when you get the prompt telling you the result. If the result is bad, do not close the prompt and press accept; instead, just close the app and restart the game.
To learn more about Bitlife, see How to exile in BitLife and How to buy and sell a car in Bitlife
