Sims/Pets age up multiple times in a row

I also had this issue. I let infant age up and it skipped toddler phase.

That sounds really frustrating, especially when you're trying to do the 100 Baby Challenge! The 'double aging' glitch must be making it nearly impossible to progress. Since you’re playing without mods or custom content, it does seem like this might be a game issue rather than something on your end. Here are a few things you can try:

1. Check the Age Settings: Make sure your game settings haven’t been accidentally changed. Go to the game options and verify that your lifespan settings are as you want them.
2. Repair the Game: Through the EA app (or Origin if you’re using that), you can try repairing the game files. Right-click on the Sims 4 in your library and select 'Repair.' This might fix any corrupted files causing the aging issue.
3. Reset the Sim: If the problem persists with a specific Sim, try resetting them. You can do this by opening the cheat console (Ctrl + Shift + C), typing resetSim [Sim's full name], and pressing Enter.
4. Check for Updates: Sometimes, these kinds of issues get fixed in patches, so make sure your game is up to date.
5. Contact Support: If the problem continues, it might be worth reaching out to EA Support. They might be able to help, especially if it's a less common bug.

I hope one of these steps helps, and you can get back to your challenge without any more aging issues!

Also having the same issue as seen in the video attached. Removed my mods folder, and the glitch still occurred. 

I’m having the same issue on PS5 too, and no amount of restarting/redownloading/updating has fixed it yet :( 

Mine skipped kid, also removed the trait I picked once aging up into a kid somehow 

I have had this occure on both PC and console. On console it happened about a month ago, and PC just happened today. I don't use CC or mods.

I have the same issue and it has happened a few times. First time it aged up from infant to an adult and second time from infant to a teen

It's happened to me but with a non-household sim -- He was a Teen Wednesday, stayed the night and aged up early Thursday to YA and then went home (after messing with his new trait in CAS with fulleditmode on) and then on Saturday I asked him to move in and I noticed he was an Adult. Ick (used CAS fulleditmode to fix him but still).

Having the same issue in my game. My game is a vanilla game, never had any mods or CC. Infant in my household went from infant to teen. I'm resetting my game as we speak. Hopefully I don't continue to have this issue