"We are shocked and in the kind of deep pain you only hear about, the kind of pain we've never felt before," Chrissy wrote on Instagram alongside a series of devastating photos of herself with John and their son in hospital.
"We were never able to stop the bleeding and give our baby the fluids he needed, despite bags and bags of blood transfusions," she went on. "It just wasn't enough."
"We never decide on our babies' names until the last possible moment after they’re born, just before we leave the hospital," she continued. "But we, for some reason, had started to call this little guy in my belly Jack. So he will always be Jack to us. Jack worked so hard to be a part of our little family, and he will be, forever. To our Jack — I'm so sorry that the first few moments of your life were met with so many complications. That we couldn't give you the home you needed to survive. We will always love you."
Since then, Chrissy has been open about struggling to come to terms with her loss, revealing in November that she was in a "grief depression hole."
She went on to announce in December that the complications, which she also experienced during her other pregnancies, meant she would "never be pregnant again."
"I love being pregnant, so so much," she wrote on Instagram. "And I'm sad I never will be again."