I was just thinking, if there are at best 31 inches of headroom and the seat would be at a minimum of 8 or more inches we are left with enough room for a three year old or a short 4 year old at best. Don't forget all the 'stuff' you need to fit back there when you have a new infant!!! Our X5 has a stroller, diaper bag, and errands items (groceries, shopping, etc). We now have 2 children and the back is taken up completely by booster and baby seat. If wife could not take the stroller with her, the car would become useless.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New