Having a difficult time with feedings

My newborn is almost a month old. I do breastfeed, I latch her on when I can but I also formula feed bc just tbh it helps me get more sleep I need to take care of my other kids.

Anyway, I need to know which brands of a bottle to get, besides Dr browns. Also, she’s having a hard time pooping and she cries in what seems like pain from gas or something like every 10 mins when she isn’t in her swing. Which I find kinda odd bc she is fine in her swing?? Help me 🤣🤣🤣