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What causes a baby to be born with a mermaid tail?

Author

William Rodriguez

Published Jan 10, 2026

Sirenomelia, which is also known as mermaid syndrome, is an extremely rare congenital developmental disorder characterized by anomalies of the lower spine and the lower limbs. Affected infants are born with partial or complete fusion of the legs.

What causes a mermaid birth?

Mermaid syndrome, or sirenomelia, is a set of genetic abnormalities that cause a baby to be born with fused limbs, which may resemble a mermaid's tail. The condition is very rare, with only 300 reports of this condition occurring in the world and is often fatal.

Can mermaid syndrome be corrected?

Most babies with this condition are stillborn or die within a few days of birth, despite treatment. Worldwide, only a few babies have survived beyond the newborn stage. It is sometimes possible to detect mermaid syndrome as early as 13 weeks of pregnancy, and some people may choose a termination in these circumstances.

Can a baby be born with a mermaid tail?

The mermaid syndrome (sirenomelia) is an extremely rare anomaly, an incidence of 1 in 100,000 births, in which a newborn born with legs joined together featuring a mermaid-like appearance (head and trunk like humans and tail like fish), and in most cases die shortly after birth.

What is a mermaid baby birth?

During a mermaid birth, the baby is delivered in a wrapped in a soft bubble, making it look like a gift wrapping. It is also called veiled birth or en caul birth. As per several experts, this kind of birth takes place only in one in 80,000 times.

28 related questions found

How do mermaids mate?

Mermaids have vaginas, mermen have penises in sheaths, kind of like dolphins, and male mermaids have both penises and vaginas. Q: How do merpeople have sex? When any group of merpeople love each other very much, they rub their parts against each other, sometimes inside each other, in a special, watery cuddle.

What does it mean when baby is born in Sac?

No, an en caul birth occurs when the baby is born inside of an intact amniotic sac. When your water breaks, it means the amniotic sac surrounding the fetus has ruptured. In some cases, the ruptured amniotic sac is still covering the baby when it is born. This is known as a caul birth.

What causes sirenomelia?

Causes. The exact cause of sirenomelia is unknown. Researchers believe that both environmental and genetic factors may play a role in the development of the disorder. Most cases appear to occur randomly for no apparent reason (sporadically), which suggests environmental factors or a new mutation.

What does a caul look like?

An en caul birth is when the baby comes out still inside an intact amniotic sac (caul). This might make it look like your newborn is completely gift-wrapped in a soft, jello-like bubble. An en caul birth is also called a “veiled birth.” This rare thing of beauty happens in less than 1 in 80,000 births.

How many types of sirenomelia are there?

2. Schematic depicting the seven types of sirenomelia. Classification is according to Stocker and Heifetz (Stocker and Heifetz, 1987). Alternative nomenclatures, used more frequently in the past, are indicated underneath.

Is sirenomelia compatible with life?

Sirenomelia (mermaid syndrome) is a rare congenital fetal anomaly with characteristic feature of complete or partial fusion of lower limbs. Although, this syndrome is incompatible with life due to the association of several congenital visceral abnormalities; however, there are few reports of surviving infants.

Can a baby be born without the umbilical cord attached?

Omphalocele is a birth defect in a baby's abdominal (belly) wall that develops before they are born. It is a rare condition causing an infant's intestines or other abdominal organs, such as the liver and spleen, to stick outside of the belly through the umbilical cord.

Can a baby be born with a veil over its face?

A caul or cowl (Latin: Caput galeatum, literally, "helmeted head") is a piece of membrane that can cover a newborn's head and face. Birth with a caul is rare, occurring in fewer than 1 in 80,000 births. The caul is harmless and is immediately removed by the parent, physician or midwife upon birth of the child.

What is the rarest month to be born in?

According to the CDC, February is the least common birth month.

Can you deliver baby without your water breaking?

In a phenomenon known as en caul births, a woman can give birth to a baby without the water breaking first. It is exceedingly rare—about 1 in 80,000 births, and it is exceedingly cool. In most births, the power of the contractions or the baby's movements will cause the bag of water to release.

How common is it for a baby to be born in the amniotic sac?

In most cases, the amniotic sac breaks on its own during birth, which is commonly referred to as a mother's "water breaking." But in rare cases -- roughly 1 in 80,000 births -- babies are born with the sac fully in tact, referred to as "en caul."

What is an evil mermaid called?

Sirens; the dark, edgy sisters of mermaids. Sirens are considered to be evil creatures who live in the sea. Generally, they are depicted as beautiful women with the tails of fish, but they can also be shown as scary, humanoid creatures with sharp teeth for tearing apart humans.

What is the male mermaid called?

Mermen, the male counterparts of the mythical female mermaids, are legendary creatures, which are male human from the waist up and fish-like from the waist down, but may assume normal human shape.

Do mermaids get pregnant?

The female will lay the eggs and they will be dispersed through the water where the male will fertilize them. But some fish engage in a form of intercourse or a mating ritual. There are also types of fish that can fertilize themselves. The best hypothesis for mermaid reproduction is that they mate in the same fashion.

What is the golden hour birth?

The first hour after birth when a mother has uninterrupted skin-to-skin contact with her newborn is referred to as the “golden hour.” This period of time is critical for a newborn baby who spent the past nine months in a controlled environment.

Can a baby drown in the womb?

Because it's normal for a fetus's lungs to be filled with fluid, a fetus can't drown in the womb. If there is a problem with the placenta or umbilical cord, there's no other way for a developing baby to breathe.

What causes umbilical cord abnormalities?

The cord may be too long or too short. It may connect improperly to the placenta or become knotted or compressed. Cord abnormalities can lead to problems during pregnancy or during labor and delivery. In some cases, cord abnormalities are discovered before delivery during an ultrasound.

Who is the oldest person with mermaid syndrome?

Tiffany Yorks

She was the longest-surviving sirenomelia patient to date. She suffered mobility issues due to her fragile leg bones, and compensated by using crutches or a wheelchair. She died on February 24, 2016 at the age of 27.

What happened Leslie Pepin?

Pepin, 43, was stopped Feb. 7 at the building's security checkpoint and the weapons were discovered. He was charged with possession of dangerous weapons in a federal facility, which carries a maximum penalty of up to one year in prison and a fine of up to $100,000. U.S. District Court Judge D.