I have a 2010 Odyssey.
My tentative plan when #3 arrives is to take out the plus one seat in the middle and move over the passenger captains chair to the middle. DD and DS1 will be in the middle (DS1 is 5 so he will probably be more help than a pain with the baby) and DS2 in the back on the passenger side. With the middle row seat pushed over, there is a clear path to the back to buckle in a child in the rear. We had that configuration last summer when we did lots of carpooling and it worked well. Did that make sense? If I have to rearrange, I will. I would love to get the baby on the driver's side, but DS1 is in a FR85 with a seatbelt install and that means the seatbelt would be in the middle of the walkway so we will probably put baby on the passenger side and DS1 behind the driver.
Mom to Two Wild and Crazy Boys and One Sweet Baby Girl