Congratulations but.....
... I have to disagree a bit. The Model S is quite bad for babies. The ride is so quiet that babies sleep much worse compared to a petrol car where the humming noise of the engine buts them to sleep in no time. In the model S however, no such humming therefore baby doesn't sleep as well.
I must say, when I read this post, I literally laughed out loud. It is so contrary to our experience with our MS when we have not one, but two babies who have spent virtually their entire driving lives in the MS.
Our twins sleep just fine in the MS and don't sleep any better when we have to take them in our Highlander, which fortunately isn't very often. I can't count the number of times that we got the twins in their car seats when they were in meltdown mode or near meltdown mode and, within a couple of minutes after getting mobile in the MS, they were content as can be and in most cases fast asleep. For them and I believe most babies after talking with many other parents, it's the motion of the car that matters the most and not the sound of the engine.