Colicky/gassy babies

I have a month old baby girl. For the past 3 days, she has not been sleeping well at night. During the day, she’ll sleep maybe for 3-4 hours and at night she’ll sleep for 30min to an hour and wake up crying because she’s hungry. I feed her until she stops feeding. I normally breastfeed but give formula maybe once a night. She’ll also be asleep but cry and then fall asleep again. I feel like if she’s in pain or something. Just want mamas advice. Is it sleep regression or is she colicky or gassy?