Jesy Nelson's unborn twins' health condition explained as she gives major update on emergency procedure

After Jesy Nelson provided an update following an emergency surgery to save the lives of her unborn twins, fans of the star have been asking questions about her diagnosis.

For those out of the loop, the former Little Mix star - who announced her pregnancy with partner Zion Foster in January - revealed earlier this month that she and her twin babies had been diagnosed with pre-stage TTTS.

The condition refers to twin-to-twin transfusion and, whilst rare, can pose a fatal risk to both babies if not caught in its earliest stages.

When first breaking the news on 6 March, Jesy explained in an Instagram video: "I am being monitored very closely and I have to go and be scanned twice a week.

"The current situation is that every time I've gone it has got a little bit worse but we are just hoping and praying for the best."

Jesy Nelson, who is pregnant with twins, was diagnosed with TTTS (Instagram/@jesynelson)

Days later, the 'Boyz' chart-topper, 33, disclosed that hospital staff had recommended she undergo emergency surgery after suffering a handful of alarming symptoms of the condition - 'like my belly tightening, struggle breathing'.

She and Zion claimed they were informed by medics the procedure would give their children 'the best chance of surviving'.

TTTS in pregnancy sees twins sharing one placenta - as well as a network of blood vessels that supply both oxygen and nutrients - instead of each feeding off their own.

This can result in the vessel connections within the placenta not being evenly dispersed, potentially triggering an imbalance of blood exchange between both of the babies.

In the worst of cases, one baby could be underfed as a result - prompting malnourishment or worse, organ failure - and the other baby overfed, which could leave them susceptible to an overwork of the heart.

Last night (30 March), however, Jesy provided another update, revealing she'd now undergone the procedure and that it had been deemed a huge success.

"Hi guys, so we just wanted to give you an update because we know it's been a while," the former X Factor contestant began in a new clip.

"First of all, we want to say a Happy Mother's Day to all the amazing and strong mums out there. And secondly, we are still in hospital, so I've been recovering," she continued, before lifting the lid on the 'amazing news'.

"The TTTS has cleared up," Jesy continued. "The operation was a success which is just absolutely incredible. We are so, so, lucky to have the most amazing doctors."

She added: "Basically, the situation that we're in now is my cervix is very, very, short, so I can't leave the hospital because my waters could break at any point and I'm still very, very, early."

Jesy announced her pregnancy in January (Instagram/@jesynelson)

The singer went on to explain that she's been advised not to leave the hospital for a 'certain amount of weeks' as a result.

"Every week we're praying that the babies stay in my belly but yeah, we are just so grateful that they are still here and they're still growing strong and we're just so grateful," Jesy continued.

Zion then added: "We're in such a blessed, blessed, situation to even be able to make this video and share this good news."