I don’t think this is so much a “fundie” trend, but more of an instagram influencer wannabe trend. I have seen several other people do this very same thing and they are far from fundie. I think part of the problem is we live in a society where people feel if they don’t document, post, and share every single thing, it didn’t happen.
While I don’t understand posting pictures of you holding your hospitalized child, I DO understand using social media to update on their condition. My sister (an adult) had a terminal illness. She was diagnosed at age 10. At 31, she was fighting for her life, and was constantly getting phone calls, texts, etc, wanting updates on how she was doing. Answering that many people daily was not only tiring, but it was taking time away from how she wanted to spend her time - with her very young daughter. She created a Facebook page and could post 1 update for thousands of people at once. It didn’t completely stop people from contact her, but it gave them an outlet to read how her days were, They could comment or message her with well wishes And she could read or respond at her convenience, if she did at all. I wish my parents had been able to do the same when she was a child and would spend months at a time in the hospital, but I don’t even think we had internet during those days. Haha!