I was accused of this 30 years ago and assessed by a psychiatrist considered an expert in MSBP at the time. He couldn't diagnose me because I didn't have it, however he mentioned "mild BPD" and advised me to humble myself because I disagreed that I had deliberately caused multiple metaphyseal fractures in my 6 week old, 5 weeks premature DC without any other signs of abuse. (Metaphyseal fractures are abnormalities in the unhardened growth plate of babies bones, and are occult and mostly symptomless, often only picked up on X-ray.) I've posted about it on other relevant threads, if anyone wants to cross reference.
Back then it was a novel "diagnosis" that was brought into the public domain due to Beverley Allitt, and experts like Roy Meadows and David Southall, who did untold damage to mothers like Sally Clarke, rest her soul. It was definitely used in cases where medics couldn't easily figure out what was going on with a child, and unfortunately switching the focus from child to mother with a psychological focus did lead to children being medically neglected.
The book mentioned by a PP is a very good explanation of the methodology.The bit about becoming your own expert stands out - i was told my research and keeness to get to the truth was basically unseemly - my focus should be solely on my baby - who was in foster care for 18 months, with whom contact was limited, and I had been told that if I couldn't come up with an alternative explanation he would be adopted. Quite what they thought i should do, while my good but out of his depth solicitor floundered around and had other clients, I'm not sure.
The allegations of attention seeking could hardly apply to me, as the fractures in question don't present dramatically or in a life threatening way, and I was as shocked as everyone else.
When i asked for a test to determine if maybe there was a chance of collagen disorder / OI, I was told it could be viewed as possible further abuse, and even if it came back positive, it didn't change the fact that abuse had occurred, because at that time metaphyseal fractures were considered pathognomic of child abuse. I believe things have moved on since then, due to cases like the Websters.
Now I don't doubt some people do harm their children and some do it for emotional or financial gain - the whole Gypsy Rose saga is the worst case of this in recent times - BUT FII is a relatively easy way to deflect from medical mistakes / poor practise, and I'm not surprised SEN children and their parents are feeling the brunt of it again.
The current rhetoric around benefits claimants with disabilities / complex conditions and the cost of it all might also feed into a resurgence of interest in placing blame back on parents.
It's a murky and harrowing area of psychology/ child protection, and I stand in sorrowful solidarity with those who've posted here having had a taste of it. CPTSD is a common result.