Fishel gave birth a week ago, but her baby boy is still in the ICU.
It's a boy for "Boy Meets World" star Danielle Fishel, the first child for the actress and husband Jensen Karp.
The baby, who they named Adler Lawrence Karp, was born four weeks early and is still in the hospital after fluid was discovered in his lungs.
Alongside a picture of the baby's empty nursery and the first photo of the little guy in the hospital (it's the second slide below), Fishel went into detail on the newborn's condition.
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"One week ago today, on 6/24 at 4:52am, Adler Lawrence Karp made his entrance into the world, 4 weeks early," wrote Fishel. "My water broke on 6/20, one day before my work week directing at 'Raven's Home' ended and my maternity leave began. I was hospitalized that night and put on magnesium sulfate because Adler was only 35 weeks old. Unfortunately, after doing an ultrasound, our amazing OB discovered fluid in his lungs that was not there during our last appointment only 10 days earlier - and thus we entered a nightmare we'll never forget."
"We still don't have Adler home with us because the deeply good doctors and nurses in the NICU are working diligently to find out why the fluid is there and determine the best way to get it out," she continued. "This has been the most trying week and a half of mine and @jensenkarp's lives but we have gotten through it with the support of our incredible family and friends who have shown up for us in unexpected ways."
Fishel added that the situation has only made her relationship with her husband "closer than we ever thought possible," as they leaned on each other for support.
"We feel helpless and powerless and useless and we wanted so badly to follow our 'birth plan,' unsurprisingly none of which involved leaving our beautiful baby boy at the hospital for the first weeks of his life," she continued. "We have also struggled with making this announcement - we are THRILLED Adler is here and we want to shout it from the rooftops but we know posting about his birth and its complications opens us up to prying eyes."
She ended her message on a positive note, saying she can't wait to share more details when the baby is finally at home. "He hates having a poopy diaper for even 1 minute, he loves bath time, he has the cutest sneezes I've ever heard," she added.
Fishel's husband also wrote about the "rollercoaster ride of emotion, terror, vulnerability and unadulterated sadness" since the fluid discovery. He called his wife "a partner in every sense of the word" and celebrated her as "the parents I can only hope to be half as good at some point."
He ended his note by saying Adler is "already the center of my universe" and is "fighting so hard every single day."