What is gripe water for? Is it for gas? My dd gets fussy throughout the day, not horrible but it makes it hard to get…

What is gripe water for? Is it for gas? My dd gets fussy throughout the day, not horrible but it makes it hard to get her down to nap. Sometimes i have to be holding her straight up on my knee bouncing her inorder to get her to sleep which makes me think she has gas trapped. Shes a champ at sleeping at night she sleeps in long streaches but it takes a good hour or more to get her to sleep with alot of arm flailing and popping off the breast like something is making her uncomfortable. Do you think gripe water would help settle her a bit? If so what brand do you reccommend?