I think it's important to note that in his 3rd and 4th months Luke could not ride in a standard infant carseat without choking. His low tone would just 'curl' up and therefore when he cried in his carseat..we would have to stop as he would start choking/turn blue and then we had to put oxygen on him. (yes..very scary)
I found this carseat off the internet for $60 and it was a FLAT BED. It was not the safest carseat in the world, but it worked! When we had to drive to doctor's appt's....he would be just fine. It was a life saver. It's FLAT with zero raise and/or tilt.
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We had to hold his passy in his mouth from 0-4mths. When asleep..we would prop it.
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About the same, kicking his feet, his hands and more verbal. His babbling was very weak as was his cry. In fact, he never really had to cry..we jumped at every sound.