Horrfiying the disregard these "parents" had for their own children! Decades ago, I read on a message board about child abuse done by MD that she wrote about in a blog (lol remember those?) to other homeschool/quiverfull mothers. When the TV show happened, those posts were wiped, and I'm not sure screenshots really even existed yet. This would have been the late 90s.
However, these forms of abuse have since been documented in the documentary "Shiny Happy People." Some of them were eventually admitted to by MD. Perhaps even more shocking, M&JB (man would that misogynist hate that I just wrote her initial first, haha) were adherents of a "man" named Bill Gothard who wrote literal child abuse manuals that resulted in the murder of at least 3 children and was himself a prolific pedophilic predator.
Article about the documentary with evidence of MD child abuse:
‘Blanket training’: Duggar family documentary shows harsh way babies taught obedience
WS thread on Gothard-linked child murders:
To train up a child, book has lead to the death of 3 children
Wikipedia page on Gothard, including 34 disclosures of sexual abuse and more info on his brutal and deadly child abuse practices:
Bill Gothard - Wikipedia
Edit to fix link!