A woman has revealed that she was pregnant with two babies, but they were not twins. While one fetus was six weeks old, the other was eight weeks old. This extremely rare occurrence is believed to be a case of superfetation.

Taylor Henderson recounted the unexpected news she received after having her ultrasound when she was eight weeks pregnant.

“I was worried because I had no symptoms at all. I did feel a little bit of nausea with my daughter, and so far with this pregnancy, I literally had nothing other than exhaustion,” Taylor, who has a six-month-old daughter, explained.

A woman revealed that she carried two fetuses simultaneously, but they were not twins: one was eight weeks old, and the other was six weeks old

Image credits: Freepick

“We go in for the ultrasound. Right away, we see the baby. Everything looks normal on my end. The tech [ultrasound technician] then says, ‘I’m gonna look over here real quick,’ and goes above the baby. She sees this tiny little black area with a tiny little baby inside.

“Naturally, my husband and I are in pure shock [because] the tech just pointed out a second baby. We’re just trying to process all of this because one is clearly larger than the other.

“We don’t know what’s happening. Even the tech is like, ‘I need to take some pictures and ask the doctor.’ So she zooms in on the little baby, and it’s measuring to be six weeks, and there’s a heartbeat.

“When we’re in the second room, the doctor walks by with the tech to the ultrasound and goes, ‘Two weeks apart? That’s impossible.'”

Taylor Henderson recounted the unexpected news she received after having her ultrasound when she was eight weeks pregnant

Image credits: taylorlaurenhenderson

Wanting to see the phenomenon with her own eyes, the professional ordered another ultrasound.

“The doctor explained that, from what she could tell, I’m having a superfetation pregnancy.”

“So I’m currently eight weeks pregnant and six weeks pregnant.”

“[The doctor] explained that she had never in her career seen this in person. She had only read about this happening.” 

“The doctor walks by with the tech to the ultrasound and goes, ‘Two weeks apart? That’s impossible'”

@taylorlaurenhenderson Answering your questions! Im not a doctor and dont claim to know anything! Just sharing my #superfetationpregnancy story! If you havent already, watch my #superfetation video before uou watch this! #twinpregnancy #twinpregnancyjourney ♬ Dream Away – Ramol

Superfetation is a rare phenomenon where a second, new pregnancy occurs during an initial pregnancy. It’s so improbable that the chances of experiencing this type of pregnancy are near zero, according to the Cleveland Clinic.

With superfetation, another ovum (egg) is fertilized by sperm and implanted in the womb days or weeks after the first one, bypassing your body’s natural barriers that prevent a new pregnancy while you’re pregnant, the medical center adds.

Like twins, two fetuses share the same womb and develop alongside each other. Usually, they’re also delivered at the same time.

However, unlike twins, embryos don’t form during the same menstrual cycle, meaning they will develop at different gestational ages.

Taylor’s doctor told her she had a “superfetation” pregnancy, a rare phenomenon in which two fetuses develop at different gestational ages

Image credits: taylorlaurenhenderson

Image credits: taylorlaurenhenderson

This event is rare in humans and observed in animals much more frequently. Of the few cases of potential superfetation reported in the medical literature, most have been in women undergoing fertility treatments like in vitro fertilization, as per Healthline.

As Taylor explained, her doctor referred to the fetuses as Twin A and Twin B, even if they weren’t technically twins because they had been conceived at different times.

In a subsequent post, the mom shared that between April 3—the date she recorded the video—and April 14, she had gone to an OB appointment where she was told that she had lost the second and youngest baby.

“[The baby] had continued to grow at a normal pace, and the heart stopped beating, which stopped the baby’s growth at that point.”

In a subsequent video, the mom shared that she had lost the second and youngest baby

@taylorlaurenhenderson Replying to @Jai Vicky This is a draft from early April. Since this was recorded, we did end up losing the younger baby early on in the pregnancy. But, to answer everyone’s question… while it is NEARLY impossible, you can get pregnant after already being pregnant! #superfetation #superfetationpregnancy ♬ original sound – TAYLOR HENDERSON

She also addressed questions from followers, including how she knew that the babies were not twins. “This was said by my actual OB that these were not considered twins because, since I got pregnant at two separate times, the eggs came from technically two different cycles.”

Referring to the possibility of the smallest fetus being a twin that was at a different gestational age, Taylor asserted that her doctor was certain of her diagnosis. 

“I’m sure my doctor would know. It was clear at my eight-week ultrasound that there was also a six-week pregnancy [where] everything looked fine, so there was no reason to believe that it wasn’t developing as quickly.”

Additionally, Taylor said that she doesn’t have two uteruses.

“[The baby] had continued to grow at a normal pace, and the heart stopped beating, which stopped the baby’s growth at that point”

Image credits: Lisa Fotios

Superfetation is so uncommon that the chances of experiencing this type of pregnancy are near zero

Image credits: John Looy

According to the Cleveland Clinic, many claimed instances of superfetation turn out to be a misdiagnosis of other conditions affecting twins with differing growth rates.

It’s unclear whether Taylor Henderson’s case was medically documented.

Bored Panda has reached out to her for comment.

“I’ve been a labor nurse for 30+ years and never seen this,” a social media user wrote

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