Nearly a decade after its release, Undertale is still inspiring memes, and one of the most prevalent examples since 2023 has been the recently revived "Baby Bones" meme.

The meme comes from the /r/Undertale subreddit, and it's all about the supposedly unseen brothers of Sans and Papyrus that seem to appear only in name and nowhere else.

So, where exactly does the Baby Bones meme come from? Are these characters real, and how has the meme evolved in 2025? Here's what you need to know.

What Is The 'Baby Bones' Meme?

The Baby Bones meme started in March of 2023, when Redditor u/Midnight2am posted a screenshot from Undertale to the /r/Undertale subreddit where Sans says, "That's for baby bones." The post is titled, "Found this while going through Snowdin, is this a lost skeleton brother or something?" suggesting that the poster thought "Baby Bones" was the name of a third brother.

It's heavily debated whether this post was a troll or not, but either way, it took off. Over the following days, members of the /r/Undertale community began posting references and parodies of u/Midnight2am's post, including other purposeful misinterpretations of Undertale screenshots, fan art of Baby Bones and more.

How Are 'Baby Bones' And The 'Secret Skeleton Brothers' Used In Memes?

The Baby Bones meme continued to grow on the /r/Undertale subreddit between 2023 and 2025, occasionally popping up outside of the subreddit on sites like X / Twitter.

The meme is sometimes considered annoying by longtime users of the subreddit /r/Undertale, who have seemingly grown tired of the format.

Now, the meme seems to be experiencing a bit of a revival on both the /r/Undertale subreddit and X.

Recently, users have been getting a lot of upvotes and likes by posting purposeful misinterpretations of Undertale quotes and claiming that they hint at the existence of a new brother.

Many of these memes include fan art of the supposed new brother, with some examples including brothers like "Dirty Brother," "Has a Very Special Attack," and "Pretty Soon."

What Are Some More 'Skeleton Brothers' Memes?

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For the full history of Papyrus and Sans' Brothers, be sure to check out Know Your Meme's encyclopedia entry for more information.