Sims 1 vs Sims 2 vs Sims 3 vs Sims 4 - Birthdays 

Sims 1 vs Sims 2 vs Sims 3 vs Sims 4 - Birthdays
Sims 1
In The Sims 1, Sims can have birthdays, but they won't age. If you want more Sims to celebrate your birthday with you,. You also need to buy a birthday cake from buy mode, The birthday cake will have candles that are already lit. They will stay lit for 2h, in which time Sims can blow out the candles. Sims will autonomously gather around the cake, put party hats and cheer and celebrate by blowing through party horns and rattling noisemakers. After blowing out the candles, The Birthday Sim will be the first one to take a piece of cake and then the other Sims will autonomously grab a piece. The Party hats will stay until they finish their cake.
Sims 2
Birthday Cakes actually have a purpose in The Sims 2, and are used to celebrate a Sim's birthday, aging them up to the next life stage. There are seven life stages in for non occult Sims in The Sims 2. When a baby is having a birthday, they need to be carried to the cake by a teen or older Sim. nearby Sims will autonomously come to watch, cheer and celebrate. A toddler will also need assistance from a teen or an older Sim when blowing out candles. The number of candles on the cake, except for a baby, signifies the age of the Sim blowing them out. Sims can blow out birthday candles 1 day before their birthday. They can also throw a birthday party. When Sims throw up a birthday party and age well, and you have cinematic events enabled, when Sims grow up well, there is a special cinematic cutscene for every life stage.
Sims 3
Birthday cakes in The Sims 3, can be used to age up a Sim by one life stage at any time. You can get one from buy mode or buy one from a grocery store. Like in The Sims 2, babies will need a teen or an adult to bring them to the cake. other Sims will cheer and celebrate. The adult will put the baby on the ground. like a caterpillar. Sims can grab a cake after the Sim ages up. In The Sims 3, you can age up a Sim by one life stage per day. you don't have to wait for their actual birthday Toddlers also need help when blowing out the candles. Every life stage adds one birthday candle to the cake. Sims can also throw a birthday party any time and anywhere. Home or Community lot. There is no longer a need to wait 1 day before your birthday.
Sims 4
In the Sims 4, Any cake can be a birthday cake. but you can no longer buy one, you need to bake it. After the cake is ready, you'll have an option to add birthday candles. Like in The Previous Sims games, infants will need help from a teen or older Sim to blow out the candles. As of 2017, infants will grow into toddlers. Before this patch, babies in The Sims 4 aged up into children, as they do in The Sims. Toddlers also need help blowing out the candles. Nearby Sims will come to celebrate with you. Sims can grab a cake after blowing out the candles. Like in The Sims 3, you can age up a Sim anytime, you don't have to wait for their actual birthday. Sims can also throw a birthday party. Choose the Birthday Sim, The Guests. You can also hire a Caterer, a Mixologist and an Entertainer. Sims can throw the party on any residential or community lot.
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