15-passenger vans are not very safe vehicles in general. Federal law prohibits their use for transporting children to and from school or school activities, and some states also prohibit their use by child care centers. If they do not have stability control, they roll very easily, and many of them lack appropriate headrests and lap/shoulder belts in some of the seating positions.
That being said, sometimes there is no alternative, particularly for families with many children. But before placing any child in a 15-passenger van, I would look very carefully at all the available safety data so as to determine the best positions. (An infant in a rearfacing seat will likely be one of the safest passengers in the van.)
Here's a link to the NHTSA advisory on 15-passenger vans.
http://www.nhtsa.dot.gov/Cars/problems/studies/15PassVans/15PassCustomerAdvisory.htm
I'm not sure whether Virginia regulates their use further. Is this your van, or someone else's? Is it for your own children, or do you run a child care facility? If it's not your van for your own children, you should certainly look into Virginia laws concerning it.