A "super-fertile" mother in the UK conceived her second child just four weeks after her first, and she didn't realise it until the babies were born.&nbsp;Sophie Small, 30, gave birth to daughters Holly and Darcy in August 2020, mistaking the girls for twins at first.

Midwives were puzzled by the twins' disparities in size, with Darcy weighing 4 pounds, 2 ounces and Holly, who was delivered second, weighing a significantly heftier 6 pounds, 1 ounce, reported the New York Post.

Doctors then discovered that the daughters were conceived a month apart owing to superfetation, a condition in which a second pregnancy develops soon after the first.

Small told Kennedy News that her pregnancy was "horrific."

She had severe morning sickness and was hospitalised eight times in seven weeks.

“I was carrying two babies who were growing at different stages, but we didn’t know that,” the mom stated.

“They couldn’t work out why I was so sick. I was expecting twins but one was bigger than the other,” she added.

“They had their own sacs and placentas, so they could feed when they wanted to.&nbsp;But they [doctors] couldn’t work out why one twin was bigger than the other,”&nbsp;she further explained.

ALSO WATCH |&nbsp;Superfetation: Can a woman get pregnant again while already being pregnant?

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Only after the girls were delivered at such disparities in size did doctors conduct testing and find that the kids were not twins at all.

“Darcy was a 32-week baby and Holly was a 36-week baby,” Small said.

The swimming instructor, who is also a mother to Oscar, says sceptics simply don't believe her when she tells them the unbelievable story.

“People think I’m a nutter [crazy] when I explain,” she declared.

“They ask how many minutes apart they are, and I say, ‘Darcy is two minutes older and four weeks younger, while Holly was born two minutes after but is four weeks older.’ “

Small claims she knew she was "very fertile" since Oscar was conceived so quickly, and she believes she ovulated again when she was already pregnant with Holly.

<h2>What is superfetation?&nbsp;</h2>

Superfetation is the term used to describe the simultaneous occurrence of two pregnancies. Days or weeks after the first ovum (egg) is implanted in the womb, a second ovum is fertilised by sperm. Given that they may be delivered on the same day and during the same labour, babies born through superfetation are frequently thought of as twins, according to&nbsp;<a href="https://www.healthline.com/health/superfetation'">Healthline</a>.&nbsp;

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A "super-fertile" mother in the UK conceived her second child just four weeks after her first, and she didn't realise it until the babies were born. Sophie Small, 30, gave birth to daughters Holly and Darcy in August 2020, mistaking the girls for twins at first.

A "super-fertile" mother in the UK conceived her second child just four weeks after her first, and she didn't realise it until the babies were born. Sophie Small, 30, gave birth to daughters Holly and Darcy in August 2020, mistaking the girls for twins at first. Midwives were puzzled by the twins' disparities in size, with Darcy weighing 4 pounds, 2 ounces and Holly, who was delivered second, weighing a significantly heftier 6 pounds, 1 ounce, reported the New York Post. Doctors then discovered that the daughters were conceived a month apart owing to superfetation, a condition in which a second pregnancy develops soon after the first. Small told Kennedy News that her pregnancy was "horrific." She had severe morning sickness and was hospitalised eight times in seven weeks. “I was carrying two babies who were growing at different stages, but we didn’t know that,” the mom stated. “They couldn’t work out why I was so sick. I was expecting twins but one was bigger than the other,” she added. “They had their own sacs and placentas, so they could feed when they wanted to. But they [doctors] couldn’t work out why one twin was bigger than the other,” she further explained. ALSO WATCH | Superfetation: Can a woman get pregnant again while already being pregnant? Only after the girls were delivered at such disparities in size did doctors conduct testing and find that the kids were not twins at all. “Darcy was a 32-week baby and Holly was a 36-week baby,” Small said. The swimming instructor, who is also a mother to Oscar, says sceptics simply don't believe her when she tells them the unbelievable story. “People think I’m a nutter [crazy] when I explain,” she declared. “They ask how many minutes apart they are, and I say, ‘Darcy is two minutes older and four weeks younger, while Holly was born two minutes after but is four weeks older.’ “ Small claims she knew she was "very fertile" since Oscar was conceived so quickly, and she believes she ovulated again when she was already pregnant with Holly. What is superfetation? Superfetation is the term used to describe the simultaneous occurrence of two pregnancies. Days or weeks after the first ovum (egg) is implanted in the womb, a second ovum is fertilised by sperm. Given that they may be delivered on the same day and during the same labour, babies born through superfetation are frequently thought of as twins, according to Healthline. WATCH WION LIVE HERE:

'Super fertile' woman gets pregnant twice in 28 days, delivers both babies on same day

A woman from California has disclosed that she conceived two daughters&nbsp;within a span of five days. After an unfortunate&nbsp;miscarriage, the couple, Odalis and Antonio Martinez, from San Pablo, California, were overjoyed to find that they were expecting a baby girl in November 2020. However, to further amplify their delight, the 25-year-old learned at her initial scan that they were expecting not one, but two girls who were conceived within the same week and five days apart.

As per&nbsp;The Daily Mail, the unusual occurrence is known as "superfetation," and it happens when a first pregnancy is followed by a subsequent one. Days or weeks after the first pregnancy, superfetation may take place, leading to another pregnancy.&nbsp;

<h2>What is superfetation?&nbsp;</h2>

Superfetation is the term used to describe the simultaneous occurrence of two pregnancies. Days or weeks after the first ovum (egg) is implanted in the womb, a second ovum (egg) is fertilised by sperm. Given that they may be delivered on the same day and during the same labour, babies born through superfetation are frequently thought of as twins, according to <a href="https://www.healthline.com/health/superfetation'">Healthline</a>.&nbsp;

The mother who spoke to The Daily Mail UK, said, “They’re technically not even identical but everyone thinks that they are. They definitely look a lot alike. Sometimes me and my husband, well more my husband, get them mixed up with each other.”

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Odalis holding Imelda, and Antonio, holding Lilo. Photo courtesy: Metro news

Also read |&nbsp;<a href="https://www.wionews.com/world/us-investigating-elon-musks-brain-implant-company-neuralink-heres-why-560510">US investigating Elon Musk's brain implant company Neuralink. Here's why</a>

In the first half of 2020, Odalis became pregnant. However, the couple learned they had miscarried in July 2020 during their 12-week checkup. The next month, she became pregnant when the couple decided to try again. She expressed her joy that the test was positive and that they were once again on their pregnancy&nbsp;journey.

WATCH WION LIVE HERE:

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A woman from California has disclosed that she conceived two daughters within a span of five days. After an unfortunate miscarriage, the couple, Odalis and Antonio Martinez, from San Pablo, California, were overjoyed to find that they were expecting a baby girl in November 2020.

A woman from California has disclosed that she conceived two daughters within a span of five days. After an unfortunate miscarriage, the couple, Odalis and Antonio Martinez, from San Pablo, California, were overjoyed to find that they were expecting a baby girl in November 2020. However, to further amplify their delight, the 25-year-old learned at her initial scan that they were expecting not one, but two girls who were conceived within the same week and five days apart. As per The Daily Mail, the unusual occurrence is known as "superfetation," and it happens when a first pregnancy is followed by a subsequent one. Days or weeks after the first pregnancy, superfetation may take place, leading to another pregnancy. What is superfetation? Superfetation is the term used to describe the simultaneous occurrence of two pregnancies. Days or weeks after the first ovum (egg) is implanted in the womb, a second ovum (egg) is fertilised by sperm. Given that they may be delivered on the same day and during the same labour, babies born through superfetation are frequently thought of as twins, according to Healthline. The mother who spoke to The Daily Mail UK, said, “They’re technically not even identical but everyone thinks that they are. They definitely look a lot alike. Sometimes me and my husband, well more my husband, get them mixed up with each other.” Odalis holding Imelda, and Antonio, holding Lilo. Photo courtesy: Metro news Also read | US investigating Elon Musk's brain implant company Neuralink. Here's why In the first half of 2020, Odalis became pregnant. However, the couple learned they had miscarried in July 2020 during their 12-week checkup. The next month, she became pregnant when the couple decided to try again. She expressed her joy that the test was positive and that they were once again on their pregnancy journey. WATCH WION LIVE HERE:

US: California woman conceived twice in a week, but how? Science has the answer

In medical terminology, the occurrence of a second conception during pregnancy is called superfetation. It can happen in just days or weeks after the first one. In simple terms, the condition is the situation when a pregnancy occurs during an existing pregnancy. It gives rise to embryos of different ages in the uterus. This condition is extremely rare in humans.

Superfetation: Can a woman get pregnant again while already being pregnant?

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