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This is the most obvious option and the most common option used by Sim parents who want to raise their children from infancy. Before choosing this method to have a baby, Sims should be sure that they are ready to take care of a child, both emotionally and financially. Maternity leave is available, so single mothers and working mothers can have a baby while still being able to work and financially take care of their child.
For two Sims to want to engage in WooHoo, they have to like each other a lot. When two Sims really like each other and are ready to try and have a baby, the try for baby action must be chosen when two Sims are in bed together relaxing. For a Sim to successfully become pregnant, the relationship bar should be nearly full. There is a fertility treatment lifetime reward available and Sims who are intent on getting pregnant, especially those who want to have more than one child, should choose this. This lifetime reward can also increase the likelihood of a Sim having twins or triplets. A single infant is challenging, but twins and triplets should only be had by experienced parents or else they may find it nearly impossible to properly care for all of the new infants in the house. If both parents take the fertility treatment, the chance of having multiples is even greater.
Another way to increase the chance of a Sim having multiples, is to have the mother read pregnancy books, listen to children's music on the radio, and watch KidZ Zone TV.