Chiropractor for baby

Has anyone had success with the chiropractor for babies that hate the carseat? We had our first session today and he fell asleep in his carseat as soon as we left which literally never happens. When I made another trip out however he was back to screaming his head off. I know it doesnt always work the first visit but I'm skeptical because it's going to cost 30 dollars per visit. I was also hoping it would help him poop because hes insanely gassy and only poops once a week. I know its normal for breastfed babies but the gas is an issue.