*Update: A 23-year-old Czech woman has given birth to quintuplets - four boys, Deniel, Michael, Alex and Martin, and a girl, Terezka - for the first time in the Czech Republic.
The odds are 50 million to one, but she has beaten them to become pregnant with quintuplets - without using in-vitro fertilisation. Ms Alexandra Kinova is due to give birth by caesarean section to the Czech Republic's first set of quintuplets.
Ms Kinova, who already has one son, did not realise she was carrying five babies until April, the Daily Mail reported.
The 23-year-old woman from the town of Milovice, about 30km east of Prague, told Czech news site denik.cz that she was in shock over the revelation.
She said: "When we finally found a fifth head, I started to cry."
Ms Kinova said that both she and her partner have a family history of twins.
Indeed, doctors told her initially that she was having twins. Then in March, she was informed that she was actually pregnant with four children.
Ms Kinova added that she has been able to sleep on her side and has not had difficulty breathing.
And she plans to breastfeed all five, as she did with her first-born son.
She also said that they still do not know the sex of all the unborn babies, despite the best efforts of the doctors.
This is because two of them are hidden beneath the other three - two boys and a girl, whom she will call Daniel, Michael and Tereza. Ms Kinova said: "I look forward very much to seeing how they will look. It's a great charm, but we cannot see anything properly - only legs and a head."
The hospital will double the number of doctors and midwives for her caesarean section.
It said that drugs have been administered to speed up the development of the unborn babies' lungs, but their condition cannot be ascertained until their birth, the Mirror reported.
Twins are born in up to one in every 100 births, while it's one in every 7,000 to 10,000 births for triplets. Naturally conceived quadruplets are born in one in 600,000 births.
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