Dad's viral reaction to finding out babies don't have kneecaps has people rolling

Becoming a parent for the first time means learning all kinds of fun facts you otherwise might have never thought of. For instance, did you know that a baby won’t produce tears till its first 3-4 weeks ? Or that their stomachs are only the size of a wee walnut ? Incredible, right? It’s enough to put any new parent in awe.

Thanks to TikTok, we see one dad ’s shock and amazement at learning that babies don’t have kneecaps—at least not in the same way that adults do. Apparently, this was new information to a lot of folks.

In a video shared by Dylan and Shelby Reese , the couple behind the TikTok account @shelbanddyl , we see a bewildered Dylan holding their son (or as Dylan says, their “no kneecap havin’’” son) presumably after Shelby has just delivered this lesser know anatomy fact.

Through laughter, Shelby tries to explain that the kneecaps will develop later, to which Dylan replies, “What kind of design flaw is this?! So you’re telling me this little nugget is kneecap-less until they’re like 2-6 years old? That’s wild!”

Dylan wasn’t the only one surprised by this. Several viewers were also unaware.

“I was today years old learning that kids have no kneecaps. I am 31,” one person wrote.

“I have 4 kids, Shelby. 4 kids and never ever knew they didn’t have kneecaps. What in the world,” another added.

Another brought in this very astute question: “is this why we can crawl as children but then it hurts when we grow up?” Seriously—the world needs to know this.

To save you Google fact checking deep dive, babies technically do have kneecaps.

But according to Healthline , those kneecaps are made of softer, more flexible cartilage that will eventually become the bony kneecap, or patella, that adults have. Much in the same way that the nose, ears and other joints evolve. This process begins between the ages of 2 and 6, and ends around the age of 10 to 12.

Having soft knee caps not only helps with the birthing process, but also makes for more comfortable crawling as babies learn to walk. So yes, the soft-to-hard knee transient problem is why adults don’t have as much fun crawling around. You learn something new every day!

Just goes to show that parenting offers new discoveries to delight in all the time.