you have to go into the status panel and go into the traits or favorites part and at the bottom there is a tab called lifetime rewards go onto that and there is a button saying lifetime rewards click that and scroll down until you find the button called fertility treatment click that now you have a chance of having either twins or triplets:) hope this helped:)
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To have more than one baby at a time on Sims 3, you have to buy the fertility treatment. A lot of people say you have to eat certain things to have triplets on the game, but all I did was buy the fertility treatment, made a baby, and I had a set of female triplets. It's not as confusing as many people say it is.
on sims 3 have the fertility treatment on both the sims and then while they are showing make them listen to kids music or you will end up with twins if you do it wrong on sims 2 you will have to get a hack
You can speed up a horse's pregnancy on Sims 3 by selecting fertility treatment. It takes 10,000 happiness points to use.
Not without mods or being lucky enough to experience a glitch. The Fertility Treatment lifetime reward does NOT allow you to have Quadruplets.
Have 'woohoo' whilst listening to Kids music and have at least one 'parent' Sim with the perk 'Fertility Treatment'.