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A mum is one of only a handful of women in the entire world to become pregnant while already pregnant.
Rebecca Roberts, 39, conceived daughter Rosalie while she was already three weeks pregnant with son Noah, due to a super rare phenomenon called superfetation.
This occurs when another egg is released during ovulation, resulting in successful pregnancy while the expectant mother is already pregnant.
Rebecca gave birth to her twins on 17 September, with little Noah weighing 4lb 10oz and Rosalie 2lb 7oz.
Rosalie was transported to St Michael's Hospital in Bristol for 95 days to grow stronger, while Noah remained at Royal United Hospital in Bath for three weeks and three days.
Mum-of-three Rebecca said: "We feel really lucky, it's so lucky to have twins anyway but to have such special twins, it's so lovely, it's wonderful, they are a blessing."
Rebecca says was, understandably, shocked to find out that she was having twins at her 12-week scan after her two previous scans only showed one of the babies.
She said: "I had two previous scans which showed Noah, she must have just been embedded.
"I had just been having a conversation with the sonographer about my previous scan so she was aware that I was only having one baby so she was so silent, I thought something awful had happened because she didn't say anything.
"Then she looked at me and said, 'Did you know you're expecting twins?'
"My heart skipped a beat. I actually said to her, 'Is this real?'
"She couldn't get any measurements of the little baby because she was so small, so she got me to go out into the car park and jump around to try and get the baby to move a bit."
Rebecca's husband Rhys had to wait outside during the scan, due to coronavirus restrictions, and was stunned by the news.
Rebecca added: "He didn't believe me until he looked at the pictures and said nothing.
"He saw twin one and twin two on the picture and he was just as shocked as me.
"It blew us both away."
Rebecca says a consultant explained to her that she had had a rare superfetation, something even her midwife 'found baffling'.
Rebecca, who is also mum to 14-year-old daughter Summer, gave birth via Caesarean section and initially had to split her time between two hospitals until the babies were strong enough to come home.
"It was amazing to finally have them all home," she said.
"It was hard work going between hospitals to see them for a while but when they finally home was fantastic.
"It was everything we wished for, it was a relief.
"It is hard work having twins but now having the family together is amazing.
"Our lives started then, after so much worry, and we feel like the luckiest parents ever."
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