Gassy baby!

My sweet 4 month old has been waking up screaming the past couple of nights with gas. Is this normal? I haven't changed anything in my diet... at one point she was sleeping 8+ hours a night. Then the past few weeks she has started waking up and nursing 2-3 times a night. I try to get her back down without nursing but then she fully wakes up and that's a nightmare of 1.5hrs getting her back down. Thoughts? She's also VERY gassy during the day too. She is pooping less frequently. About once a day maybe every other day.