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 AKRON, Ohio - When Sarah Thistlethwaite and her husband, Bill, went for their third ultrasound in the couple's 19th week of pregnancy, they received a double dose of surprising news. 
 
 "The ultrasound tech said, 'Oh, there's two.' And my husband said, 'Two what?'" Sarah recalled. 
 
 The Thistlewaites, who were once told they probably wouldn't be able to have children, suddenly learned they were having identical twin girls. 
 
 On top of that, the babies were rare mono mono twins-- a pregnancy in which twins share the same placenta and amniotic sac. 
 
 (PHOTO GALLERY: See images of delivery) 
 
 It only happens once in every 10,000 births. 
 
 "I've been practicing high-risk obstetrics for about 35 years and I've seen less than 10 cases," said Dr. Justin Lavin from Akron General Medical Center. 
 
 He said mono mono twins occur when the same embryo splits more than eight days after fertilization. 
 
 Sarah, an eighth grade school teacher, was stunned by the news. 
 
 "We were so excited that we were having twins and so that was great, and then you have the flip side of it that I knew I would have to be in the hospital for eight or nine weeks," Sarah said. 
 
 The risks, Dr. Lavin explained, include cords becoming entangled or compressed. 
 
 The couple has a 15-month-old son, Jaxon. For Sarah, being away from her toddler has been the hardest part. 
 
 "We're trying to keep his life as normal as possible so he comes up and visits for a couple of hours," Sarah said. 
 
 "It's hard to be here, be we know in the end, we're going to end up with two twin girls and they're going to be healthy and everything is great," Sarah said. 
 
 On Sarah's 58th day in the hosptial, Dr. Katherine Wolfe and Dr. Melissa Mancuso from Akron Children's Hospital delivered the twins by Caesarean section at 2:41 p.m. Wolfe and Mancuso had closely monitored the high-risk pregnancy for several weeks. 
 
 The couple named their new daughters Jenna and Jillian. They were born at 33 weeks, holding each other's hands. 
 
 SEE MORE PHOTOS OF JENNA AND JILLIAN, AS WELL AS 
 
 88 PHOTOS OF FACEBOOK FANS' MONO MONO TWINS 
 
 NewsChannel5 was allowed access to the special delivery and the parents beamed with pride as the sisters, each weighing less than five pounds, entered the world. 
 
 Doctors said the babies appeared to be doing well as they were taken from the delivery room to receive their Apgar score, which assesses the health of newborns. 
 
 As unusual as it is to have one mono mono pregnancy, doctors were blown away when the learned a second mono mono mom was being admitted to Akron General. 
 
 Amanda Arnold, 24, of Akron, is due to deliver twin girls next week and plans to name them Janiya and Amanda. 
 
 Arnold, who also has a 5-year-old son, said twins run in her family, but she was still taken back the mono mono pregnancy. 
 
 "The first one, she (ultrasound tech) looked and it was just one baby to the side and she was like, 'Wait a minute. Don't count on that one. Let's look all the way around.' The other one, they were sitting side-by-side just looking at each other. I sat up and said, 'That is not two heads.' And, she was like, 'Yeah.'" 
 
 "It's pretty surprising to have two at the same time," Dr. Lavin said. 
 
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 AKRON, Ohio (AP) — Twin girls born with a rare condition in Ohio were breathing on their own and their mom said she and her husband were able to hold them on Mother's Day. 
 
 Sarah Thistlethwaite said babies Jillian and Jenna were removed from ventilators Sunday afternoon after they were able to breathe comfortably. She told The Associated Press that she and her husband Bill both held them for a while on Mother's Day. 
 
 "It's just hard to put into words how amazing it feels to know the girls are OK," she said. "It's great to know that they're doing so well, and being able to hold them." 
 
 The identical twin girls shared the same amniotic sac and placenta. Such births are called monoamniotic, or "mono mono," and doctors say they occur in about one of every 10,000 pregnancies. 
 
 They were born Friday at Akron General Medical Center, grasping each other's hands when doctors lifted them up for their parents to see after delivery. 
 
 Thistlethwaite told the Akron Beacon Journal (http://bit.ly/1hG517d ) that was "the best Mother's Day present ever." 
 
 "They're already best friends," said Thistlethwaite, 32. "I can't believe they were holding hands. That's amazing." 
 
 Jenna was born first at 4 pounds, 2 ounces and 17 inches, with Jillian following 48 seconds later at 3 pounds, 13 ounces and 17.5 inches. 
 
 They were moved temporarily to Akron Children's Hospital because they needed breathing assistance. Thistlethwaite expects to be released from Akron General on Tuesday, while the girls will remain in the hospital two to four weeks. 
 
 Dr. Melissa Mancuso helped deliver the twins, one of several amniotic pairs she has helped deliver in 11 years. She said the twins are at risk during pregnancy of entanglement of umbilical cords, which can cause death. Another woman at Akron General is expected to give birth later this week to monoamniotic twins. 
 
 Sarah and Bill Thistlethwaite, of Orrville, Ohio, have a son, Jaxon, whose first birthday was Jan. 27. That's the day they also found out she was carrying twins. 
 
 "All I could do was laugh," said Bill, 35. 
 
 They rushed to prepare their home for the twins, and Sarah was soon on bed rest. 
 
 A middle school math teacher, she went into the hospital on March 14. 
 
 "It's hard, it really is," she said of extended bed rest. "It was very mentally challenging knowing I have to sit here all day." 
 
 Besides television, books and "trashy gossip magazines," she viewed YouTube to learn how to crochet baby hats. 
 
 The girls were born at 33 weeks and two days. Mancuso said there were only minor issues during the pregnancy. 
 
 Sometimes the girls would kick the monitors off. 
 
 "I don't know what they're doing to each other," Sarah said jokingly of her "sweet girls." 
 
 __ 
 
 Online: 
 
 Akron Children's Hospital: http://bit.ly/1shuzMZ
– Sarah Thistlethwaite was once told she wouldn't have children; just in time for Mother's Day, the Ohio woman delivered twin girls in a rare kind of pregnancy that happens about once in 10,000 births, or in, at most, 5% of all twins. As News Net 5 reports, the girls were mono mono twins—or twins that occur when an embryo splits more than eight days after fertilization, and which share the same amniotic sac and placenta. WCPO notes Thistlethwaite and her husband didn't learn they were expecting twins until her 19th week of pregnancy—and her third ultrasound. It's a high-risk pregnancy, and Thistlethwaite was hospitalized for 58 days before her C-section at 33 weeks on Friday. Not enough cute factor? Jenna and Jillian Thistlethwaite were born holding hands. And lightning strikes twice: Akron Children's Hospital, where the Thistlethwaite twins were born, will see the birth of another set of mono mono twins this week. Amanda Arnold is also pregnant with twin girls. "I've been practicing high-risk obstetrics for about 35 years and I've seen less than 10 cases," says a doctor. (Another less-than-common pregnancy case: The mother of a 25-year-old gives birth to triplets.)