E.,
When our oldest son was four months old we drove from SE Kansas to the Portland, OR, area, 2000 miles one way. I too was breastfeeding and being a first time mother I was nervous how we would cope. Well, he screamed at the top of his lungs the first leg of the trip, 200 miles. No matter what we did calmed him down. But, for the rest of the trip, Colorado, Utah, Nevada, Idaho, and Oregon he was much better. We stopped every two hours to nurse and get him out of the seat and I made sure I rotated the toys hanging from the handle of his seat. Once in a while I'd sit in the back seat with him, no easy feat since it was a small sports car.
I did not nurse him while DH drived because I'm small-breasted, I don't think it's safe and I didn't want to give truckers a free peep show.
Our trip a year later, from SE Kansas to Mobile, AL, was MUCH rougher because at 15 mo. old he was all about moving. Being strapped into his seat for hours on end made him cranky, unconsolable, and just plain miserable. No matter how many times we stopped for him to play and nurse, he still cried as soon as he saw that he was being put back into the seat. DH and I gritted our teeth and just drove as hard as we could. Since then we have had two more children and no longer take trips longer than 200 miles.
K.