Fists are normal. Food thing can be normal… is she gaining weight OK? If so, no worries. Car seat, try putting a blanket or dirty clothes in there to make it smell more like you (take them out before putting her in ofc).
For the car seat issue: make sure she is not gassy the car seat may be painful is she’s full of gas and in a weird position.
Eating fists are normal. They’re just discovering their hands and my son does it all the time. Just baby things☺️
My baby does the same and I haven’t found a solution to calm her down. She just doesn’t like car rides yet.
Car seat- make sure the head test part is at the right height, it can be adjusted. I did not know this and my baby screamed out of discomfort, then saw a YouTube video and realized it was at the shortest height and she was just uncomfortable. Seems silly now, but I had no idea. We have feeding issues as well. We warm the bottle and try to break it up into two mini feedings: 2 oz, wait 30 mins, do another 2 oz. It’s really frustrating but it sometimes helps. Our girl does the same thing with her fists, I think it’s a normal thing right now n