It doesn't matter that she now wants to drop charges. Victims don't bring charges - instead, they make a statement of events as a witness, and formal charges are brought by the state on behalf of ALL of us. Since they have a child together, this case is going to be viewed and treated internally by the prosecution as a domestic violence case, (malicious wounding being one of the many possible charges that falls under DV), and prosecutors RARELY drop such cases if there is any hint of actual injury, or if a weapon was involved, regardless of whether or not injury ensued.
The possible penalties will depend on whether they charge him as a Class 2 felony (aggrevated malicious wounding, due to the knife), or as a Class 3 felony (simple malicious wounding), and could include:
For Class 2 felonies, imprisonment for life or for any term not less than 20 years and, subject to subdivision (g), a fine of not more than $100,000.
For Class 3 felonies, a term of imprisonment of not less than five years nor more than 20 years and, subject to subdivision (g), a fine of not more than $100,000
See
http://leg1.state.va.us/cgi-bin/legp...00+cod+18.2-10
Most felonies in VA also come with an automatic $350 "fixed felony fee", to pay for things like court reporters, transcript costs, and to contribute to the Crime Victim Compensation Fund.
Bail will depend on many factors, including the court's judgement about how much of a flight risk he could be, any prior criminal history, etc. If he makes bail, he should also expect that a restraining order will be placed and he does NOT want to violate that order under any circumstances, lest he risk ADDITIONAL criminal charges.