My dd (now 8) did the same thing with car seats. I think it was a motion thing for her b/c she hated strollers and sleds too. Carrying her she was fine, but motion without being held? Sent her into a tizzy! I'm of no help I'm afraid, there really wasn't anything that helped but time. By the time she was 6ish months, we were able to get a good 20 min (thankfully, in my city, everything is about 20 min away!) in before the breakdown started.
On what may be a related note - at age 4 we found out she had a huge amount of wax buildup in her ears (and we never used qtips either) she just makes a huge amount and it ended up giving her some hearing loss at that time. (we started taking her in for a cleaning every 6mths and its helped) I'm wondering now if that had something to do with it? Just a thought.......
I wish you all the best. :hug
On what may be a related note - at age 4 we found out she had a huge amount of wax buildup in her ears (and we never used qtips either) she just makes a huge amount and it ended up giving her some hearing loss at that time. (we started taking her in for a cleaning every 6mths and its helped) I'm wondering now if that had something to do with it? Just a thought.......
I wish you all the best. :hug