There is the perception that because the mother was breathing that she could be fed with a tube and all would be ok.
Unstated and unknown is what body systems (the body is a collection of organs, systems and subsystems) were shut down. The mother’s blood is a carrier for all sorts of hormones and chemicals very specifically female and intended to provide very specialized nourishment beyond just calories to the developing child.
When the mother is dead, the systems don’t function and the child development succombs
The Chemo-mecho process device cessation is the problem
BookMark
Then there is the question of which parts of her brain were affected. Which part of the electro-mechanism, so to speak, were affected. The brains functions as a single entity, of course, but the blockage of a pathway forces the need for an alternate route. The brain is pretty plastic, but there is a limit. If decay sets in, then the whole system eventually breaks down.