J.D.
My oldest is turning 4 this month. I also have a 16 month old and a 4 month old. We had to purchase a van to install my baby's carseat. There is not a vehicle out there - that we could find, and we looked at many - where 3 carseats fit without touching each other. We were told by the Sterling Fire Department, who installed our carseats, that you could not have car seats that are touching. After looking at every model of minivan we settled on the Hyundai Entourage which provides the most space in between the 2nd and 3rd row seats. Hope this helps.