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How to age up Infants in Sims 4

Time to grow up!

The Infant is a new life stage in The Sims 4, added in the Infants Update. It sits between the Newborn and Toddler life stages, giving you new ways to interact with your child Sims like learning to crawl and sibling dynamics. But how long do you have with your Infant until it becomes a Toddler? Not long, if you want to age them up! You can even age them up from toddlers to children while you're at it. Here's how.

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How do you age up babies fast in Sims 4?

There are a few ways to age up infants in Sims 4. I'll list them below.

  • Using a Birthday Cake
  • Cheats and CAS
  • Being Patient and letting them grow up naturally

Aging up infants using a Birthday Cake

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The most straightforward way to age up an Infant in The Sims 4 is to have them blow out some birthday candles. Follow these steps to successfully age up your Infant Sim:

  • Have a teen, young adult, adult, or elder Sim bake a cake.
  • Drag the cake to the center of an island or table.
  • Click on the cake and Add Birthday Candles. Do this quickly, as sometimes a sneaky household Sim will ruin it by grabbing a slice!
  • Shift control to the Infant Sim. Click on the cake and Ask for Help with Candles.
  • The helping Sim will carry the Infant and have them blow out the birthday candles.
  • Your Infant will then age up!

Aging up infants using Cheats & CAS

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If you don't want to waste time having your Sims bake cakes and blow out candles, then consider just taking a shortcut. To cheat an age up in an Infant Sim, do the following:

  • Shift+Click your intended Sim (or any Sim in the same household).
  • Click the option that says Modify in CAS.
  • Go to the CAS profile for your Infant and choose the intended age in the top left of the screen.
  • Click the Checkmark in the bottom right when you're done.

Related: All Infant Milestones in The Sims 4

All life stages in Sims 4

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Your Toddler will grow and become a Child, a Teen, then a Young Adult, etc., over time. Each life stage is longer than the previous, with the exception of Elders as they transition to the end of their life cycle.

  • Newborn - One day
  • Infant - Five days
  • Toddler - 7 days
  • Child - 14 days
  • Teenager - 21 days
  • Young adult - 28 days
  • Adult - 43 days
  • Elder - 14 days

For more information on The Sims 4, check out All Sims 4 Family Dynamics, explained here on Pro Game Guides.

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Image of Bethany Barber
Bethany Barber
Bethany has been a writer at Pro Game Guides for over two years, but she has been into both gaming and writing for countless years. When not writing helpful guides for fellow gamers, she can be found playing on her PC or Switch, writing short stories, and watching horror movies.
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Brent Koepp
Brent Koepp is a freelance games journalist based out of California. An avid Pokemon fan for over 25 years, he has spent his career reporting on the popular Nintendo franchise. He also dabbles in Destiny 2 and JRPGs. You can follow him on Twitter @brentrkoepp.

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How to age up Infants in Sims 4

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