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Brittany Hambleton
Brittany Hambleton
May 13, 2024 ·  3 min read

A Baby was Born ‘Pregnant” and an Emergency C-Section was Performed to Remove Her Own Sibling

For some women, finding out that they are pregnant can come as a huge surprise. For Monica Vega of Barranquilla, Columbia, the shock came much later when she found out that she wasn’t the only one who was pregnant – her baby was, too. The condition is called Fetus-in-Fetu, and it’s incredibly rare.

Vega’s baby girl, Itzmara, was born at seven months by cesarean section. 24 hours later, doctors performed another c-section, this time on Itzmara herself, to remove her parasitic twin, whom she had absorbed in the womb [1].


This type of birth is an example of a very rare condition called “Fetus-in-Fetu”. Just how rare? It is thought to occur in only one in every 500 000 births [2].

Fetus-in-Fetu, or FIF, occurs when one malformed fetus is enclosed within the body of its twin. Usually, it is found within the abdominal cavity [3].

Occasionally, FIF can be misdiagnosed as a teratoma, which is a tumor that develops in the tissue of a fetus and can sometimes contain bones, muscle tissue or even hair [4].

A FIF “twin” is referred to as heteropagus or “parasitic” twin because it takes nourishment from its sibling, but it is anatomically incomplete [5]. This means that the parasitic twin is missing certain vital organs – notably a heart and a brain [2].

Other Cases of FIF

What makes Itzmara’s case so rare is that doctors were able to diagnose the FIF during the pregnancy [2]. This is incredibly uncommon, as most cases go undetected for years.

In 2015, a 45-year-old woman living in Cyprus underwent surgery for what she thought was a tumor on her ovary [6]. When the doctors performing the surgery got a closer look, they noticed the tumor on Jenny Kavanagh’s ovary had a face, an eye, a tooth and a long black hair [6]. Again, the mass had no heart and no brain.

Another report came out in August 2019 of a 17-year-old girl in India who was found to also have a parasitic twin. After going to the doctor complaining about stomach pains, they found the remnants of her malformed twin, including teeth, bones, and hair [7].

Doctors are still unsure why it can take so many years for symptoms to occur, however in most cases, once the mass is removed the patient makes a full recovery [8].

Are there any Risks Associated with Fetus-in-Fetu?

Thankfully, FIF is largely considered to be a benign condition [9]. 

It is important, however, to remove the mass in its entirety for a number of reasons. In one case, a mass that was not fully removed was reported to recur as a tumor four months later. Complete removal can eliminate the risk of potentially developing cancer later on [7].

The effects can be more than just physical. Discovering that you had a twin living inside of you for your entire life can have an emotional toll. 

“The fact that it had long black hair — just like mine — a face with one eye, and one baby tooth makes it more believable,” she said. “It’s difficult to describe how I felt when I saw it. I felt shocked, very scared, horrified, and it felt like an alien was inside me.” explained Kavanagh [6].

In the case of Itzmara, doctors opted to deliver her by cesarean section for fear that the internal twin would crush her abdominal organs during birth [2].

Today, this tiny medical marvel is doing very well according to her doctors.

“She has a little scar on her abdomen, but she is a normal baby now except that the whole world is talking about her.” [2]

Keep Reading: ‘Today is the saddest day in my life – a child was born but a mother died’


  1. ‘A baby was born ‘pregnant’ with her own sibling and needed an emergency C-section to remove it’ Insider Julia Naftulin. Published November 25, 2019
  2. ‘A Twin Inside a Twin: In Colombia, an Extraordinary Birth’ New York Times Donald G. McNeil Jr. Published March 20, 2019
  3. ‘Fetus-in-fetu: A Rare Congenital Anomaly’ Pubmed Saurabh Kumar Gupta, Parul Singhal, and Neera Arya. Published 2010
  4. ‘Teratomas’ The Embryo Project Encyclopedia Christina Raup. Published July 1, 2010.
  5. ‘Epigastric heteropagus conjoined twins: two case studies and associated DNA analysis’ Pubmed Jun-tao Xie. Published May, 2010
  6. ‘Fetus In Fetu: Doctors Find 40-Year-Old Unborn Twin Growing Inside A Woman, Complete With Face And Hair’ Medical Daily Kristin Magaldi. Published August 19, 2015
  7. ‘Fetus in fetu: A report of two cases’ Pubmed Ibrahim Karaman, Derya Erdoğan, Semire Özalevli, Ayşe Karaman, y Hakan Çavuşoğlu, M. Kemal Aslan, and Özden Çakmak. Published in 2008