Someone who damages someone else in the body has to pay for 5 things:
1) נזק - monetary loss. This is evaluated by the loss of value of the person damaged as a slave in the market due to the deformity.
2) צער - pain. This is evaluated as what would a person pay to avoid this. So if a government decreed that this had to be done to him, and he could pay to get out of it, what amount of money would he pay to avoid this.
3) ריפוי - medical expenses. All related medical expenses to heal the injury e.g. doctor's fees and medical costs.
4) שבת - loss of work. This is more limited, in that it is the loss of work while he recovers for what he could do given his new injury, and never more than his current occupation. So this is not his loss of theoretical future income.
5) בושת - embarrassment. The amount is decided by Beis Din on a case by case basis.
All of this applies by accident or not (either derived from פצע תחת פצע - a wound for a wound, or is a logical derivation from the fact that a person is liable for the damage caused by his property, which is always accidental).
However, #5 does not apply to accidents.
Applying this practically to this case has some complications, but at least at first glance it seems that #1, #2 and #3 apply. According to the story #1 is undetermined as of yet, #2 would be astronomical, and #3 is very large.
Some open questions in this case specifically - I don't know if damage (such as #4) applies to the parents having to care for the child as well as what to do with #3 if the parent's medical insurance covered the medical costs involved.