The idea of a changeling—a baby that’s not really yours, and who knows where your dear sweet little one really is?!—is so primal a fear that it’s existed in folktales for centuries. Ireland really picks this scab well in their horror movies, but they are not alone. It’s an idea that can’t help but unsettle. Here are our five favorite “that’s not your baby!” horror movies.

5. The Baby (1973)

Lord above, here’s a weird one.

Director Ted Post (Hang ’em High, Magnum Force) gets a little unseemly with this story of welfare fraud, Greek tragedy, fear of emasculation, and more. Freud would have a time with The Baby!

Mrs. Wadsworth (Ruth Roman) does not want nosey new social services wench Ann Gentry (Anjanette Comer) sniffing around. Why does she and her two perfectly normal, not at all criminal, grown daughters have to prove that their fully grown son/brother still thinks he’s a baby? The grown man in the crib and onesie upstairs.

If that’s not upsetting enough, Ann Gentry’s not all she’s cracked up to be, either. What was the deal with the Seventies?

4. The Hallow (2015)

Visual showman Corin Hardy has a bit of trickery up his sleeve. His directorial debut The Hallow, for all its superficiality and its recycled horror tropes, offers a tightly wound bit of terror in the ancient Irish wood.

Adam (Joseph Mawle) and Clare Hitchens (Bojana Novakovic) move, infant Finn in tow, from London to the isolated woods of Ireland so Adam can study a tract of forest the government hopes to sell off to privatization. But the woods don’t take kindly to the encroachment and the interloper Hitchens will pay dearly.

Hardy has a real knack for visual storytelling. His inky forests are both suffocating and isolating, with a darkness that seeps into every space. He’s created an atmosphere of malevolence, but the film does not rely on atmosphere alone.

Though all the cliché elements are there – a young couple relocates to an isolated wood to be warned off by angry locals with tales of boogeymen – the curve balls Hardy throws will keep you unnerved and guessing.

3. Hole in the Ground (2019)

Sara (Seána Kerslake), along with her bib overalls and young son Chris (James Quinn Markey), are finding it a little tough to settle into their new home in a very rural town. Chris misses his dad. Sara is having some life-at-the-crossroads anxiety.

Then a creepy neighbor, a massive sink hole (looks a bit like the sarlacc pit) and Ireland’s incredibly creepy folk music get inside her head and things really fall apart.

Writer/director Lee Cronin’s subtext never threatens his story, but instead informs the dread and guilt that pervade every scene. You look at your child one day and don’t recognize him or her. It’s a natural internal tension and a scab horror movies like to pick. Kids go through phases, your anxiety is reflected in their behavior, and suddenly you don’t really like what you see. You miss the cuter, littler version. Or in this case, you fear that inside your beautiful, sweet son lurks the same abusive monster as his father.

2. Border (2018)

Sometimes knowing yourself means embracing the beast within. Sometimes it means making peace with the beast without. For Tina—well, let’s just say Tina’s got a lot going on right now.

Border director/co-writer Ali Abbasi has more in mind than your typical Ugly Duckling tale, though. He mines John Ajvide Lindqvist’s (Let the Right One In) short story of outsider love and Nordic folklore for ideas of radicalization, empowerment, gender fluidity and feminine rage.

It would hardly feel like a horror movie at all were it not for that whole, horrifying baby thing.

The result is a film quite unlike anything else, one offering layer upon provocative, messy layer and Abbasi feels no compulsion to tidy up. Instead, he leaves you with a lot to think through thanks to one unyieldingly original film.

1. Lamb (2021)

Among the many remarkable elements buoying the horror fable Lamb is filmmaker Valdimar Jóhannsson’s ability to tell a complete and riveting tale without a single word of exposition.

Not one. So, pay attention.

Rather than devoting dialog to explaining to us what it is we are seeing, Jóhannsson relies on impressive visual storytelling instincts, answering questions as they come up with a gravesite, a crib coming out of storage, a glance, a bleat.

His cast of three – well, four, I guess — sells the fairy tale. A childless couple working a sheep farm in Iceland find an unusual newborn lamb and take her in as their own child. As is always the way in old school fables, though, there is much magical happiness but a dire recompense soon to come.