"We are shocked and in the kind of deep pain you only hear about, the kind of pain we’ve never felt before. We were never able to stop the bleeding and give our baby the fluids he needed, despite bags and bags of blood transfusions. It just wasn’t enough," Teigen posted in October of last year.
"We never decide on our babies’ names until the last possible moment after they’re born, just before we leave the hospital. 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."
Chrissy went on to explain what it was like to go through such a traumatic experience, and thanked all the people who sent the family positive energy, thoughts and prayers.
In the months following Chrissy opened about struggling to come to terms with the loss, revealing that she was in a "grief depression hole" as she had discovered 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."
The social media star revealed that she was undergoing surgery for endometriosis — a chronic reproductive condition that occurs when tissue similar to, but not the same as, the uterine lining grows elsewhere in the body.
Now, in what was the month baby Jack would have arrived into our world, Teigen explained that the symptoms of her condition remind her of him.
"My little Jack would have been born this week so I'm a bit off," she wrote on Twitter.
"I truly feel kicks in my belly, but it's not phantom," she added. "I have surgery for endometriosis tomorrow...but the period feeling this month is exactly like baby kicks. Sigh."
She went on to share a video of the stomach spasms she's been experiencing and said she pretends it's Jack "saying hi."
"Look at this," she wrote. "I'll pretend it's him saying hi — it never stops."
Leaving her news on a positive note, Teigen added that she's "proud of where this entire journey took my body and mind in other ways," she added. "I am lucky to have two amazing little ones who are transforming into big little people more and more every single day."