How to have Triplets!

Here, I will explain the method I used to have triplets. I did some research beforehand, and what I did worked, so I'll explain exactly what I did.

Before having the sims try for a baby, I gave both a fertility treatment. You can do this by either buying it for 10000 lifetime reward points, or you can buy it from the hospital. After that, try for the baby and wait until the mother is preggo. This happened for me about midnight. There's only two days that she's preggo, so plan your time wisely!

First day of Pregnancy
So the next day, have the mother read a pregnancy book. There are two, so buy both. One is (Baby Incoming: Prepare With Vigliance, and the other is Totally Preggers: An Expecting Mother's Tale). Read one for now. :)

This is also very important!! - While the mother is reading, have Kidz Zone turned on the tv, and have Kids music playing on a stereo in the same room!

So, it's time to decide whether you want girl or boy triplets! For girl triplets, have the mother eat three watermelons, and for boys, have her eat three apples!

Second (and final) day of Pregnancy
If the father hasn't read a pregnancy book, it couldn't hurt, especially if one of your sims wishes for the father to read one. I had my father read one.
Again, I actually kept the tv and stereo on Kids all day and all night. ^^;
Have the mother read the second pregnancy book on this day.

The babies are coming!
My mother went to bed that night, but woke up a bit after midnight to have the baby. While her husband was panicking and running all over the house, River just casually walked out the door, grabbed a taxi, and went into the hospital. :)

It usually takes a couple hours in Sim time to have the triplets, but after she's done, you'll be redirected to Create a Sim mode to change the mothers clothes. Hopefully, you got the triplets you wanted, and you get to name each one right after the other.
As for me, I named my three baby girls April, May, and June. (How original...)

Good luck!