I didn't respond to this originally because the size of the VSD you have given is like a pin hole, way too small to worry about.
Hello,
The following is taken from Wikipedia section on treatment for VSD:
Most cases do not need treatment and heal at the first years of life. Treatment is either conservative or surgical. Smaller congenital VSDs often close on their own, as the heart grows, and in such cases may be treated conservatively. Some cases may necessitate surgical intervention, i.e. with the following indications:
1. Failure of congestive cardiac failure to respond to medications
2. VSD with pulmonic stenosis
3. Large VSD with pulmonary hypertension
4. VSD with aortic regurgitation.
Can be read more fully at:
http://en.wikipedia.org/wiki/Ventricular_septal_defect
Hope that helps, good luck to you.