I feel for you. I do. I've had 6 pre-term losses and would be devastated if anything happened to the baby I'm pregnant with now.
But you've got to understand that you were having problems that started before birth. He may have been born without taking his own breathes yet, but the umbilical cord, until he's out, supplies oxygen. This is how water-birthed babies don't drown. But this doesn't mean something wasn't going on that resulted in him being oxygen-deprived before birth, such as the cord being compressed, wrapping around his neck, prolapsing, etc.. As it is, he was born dead and had to be revived.
You lost 25 pounds. Women who do not eat enough fat and/or who lose so much weight run the risk of their babies' brains not properly developing. Brains need fat, more so when they're developing.
All in all, there are so many reasons here that your son could be damaged. It would be an uphill battle t prove that your son was 100% perfectly fine and mentally proficient before contact with this nurse. As it stands, there are just too many other things that could be the cause. You'd also have to prove that his initial death, how he was born, had no bearing on how he ended up today.
You naturally want to find something or someone to blame, and you don't want it to be your own body. You'd benefit most from a support group right now.
Also, please watch your child closer. At 2 years old, he shouldn't be alone long enough to set fire to his hands. That could be argued as negligence.