Ryan Thomas and Lucy Mecklenburgh's son was rushed to hospital after being found "blue in his cot".
The former The Only Way Is Essex star revealed that their 18-month-old son Roman had recently returned home after almost a week in intensive care following her terrifying discovery.
Alongside a close-up photo of Roman's hand hooked up to a drip with a cuddly bunny lying beside him on the bed, Lucy wrote, "Just over a week ago I found Roman blue in his cot - probably every parent's worst nightmare. Without going into too much detail it ended up with Roman being transferred to St Mary's London intensive care being put on a ventilator. Thankfully we are now all home and Roman is back to his cheeky self."
The 30-year-old went on to thank all the people involved with Roman's care and detail how she plans to give back to help other sick children and their families.
Concluding her post, she wrote, "Although mentally we as a family may never fully recover, we feel extremely blessed to have our special boy home in our arms and it has truly opened our eyes to all the hardworking superheroes working in our hospitals who dedicate their lives to helping others and how extremely lucky we are to have these incredible medical services free for us all in the UK. Thank you NHS and all the charities that support the NHS."
Coronation Street Ryan posted a photo of him cuddling Roman in the hospital and told his Instagram followers how grateful he was to have his son back home.
"As parents it’s been one of the scariest times of our lives but with thanks to our amazing doctors & nurses we have king Roman back playing, smiling & more importantly eating, i would like to thank the @nhs and also @cosmic_charity who have been unbelievable," he captioned the snap.
Ryan and Lucy have been in a relationship since 2017 and got engaged in 2019. He has a daughter named Scarlett from his previous relationship with his Corrie co-star Tina O'Brien.