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Birthdays are an important part of parenting kids in the Sims 3. Throwing a birthday party for a Sim kid who is growing older, though not required, will increase a kid's mood. To throw a birthday party in the Sims 3 parents can choose to invite guests, order pizza, have music, have plenty of food, allow guests to swim and use playground equipment, and of course, have a birthday cake. All of these things should be taken care of prior to the guests arriving. Once it is time for the kid to age up, click on the birthday cake and choose Blow Out Candles. You will be asked to choose the kid who is aging up and then all of the party guests will gather around and watch the kid blow out their candles. When they are aging up there will be bright colors that resemble fireworks.