We have found out that N will scream in the car non stop after about 30 minutes in the car. Before our trip, we never had him in the car for longer than that amount of time. Now we have to wrestle him in the car seat and even if he falls asleep he wakes to scream about every 15 minutes.
The car seat he is our oldest seat. It does not expire for two more years, however, each of our children has sat in that seat thus far. I am not certain if he issue is just the car (it is hard to keep a not quite one year old entertained in a stationary position for long) or if it is the car seat making him uncomfortable. For what it is worth, he was also unhappy in the car seat on the airplane both ways. It was a two hour flight with me sitting next to him to keep him entertained. The flight out he spent half of the flight on my lap but I was able to get him to finally sleep on the way out (that flight was past his bed time and he was so exhausted that he did not wake up every 15 minutes to scream).
Would you all try a new seat or just see if this improves as he gets older?