I was a CP SW, the part that stood out for me was "the Mother thinks she knows best", I think that is in regards to the feeding issues.
That is beside the possible physical abuse.
I've known babies to be on solids at weeks old, bottle hygiene not adhered to etc.
They've probably been offered Parenting classes etc, but refused them and possibly non engagement.
There isn't a need for details, the children are going for adoption.
It's the Telegraphs reporting that's confusing.