My baby is a newborn preemie that gets very gassy(even stinky farts hehe), spits up often and sometimes a whole lot of…

My baby is a newborn preemie that gets very gassy(even stinky farts hehe), spits up often and sometimes a whole lot of it, and I'm looking for the best bottle for those issues that is slower flow than her medela bottles, and also so she doesn't have to catch up on breathing since it'll be slower.Possibly one that is standard instead of wide size because she is small and likes to hold her bottle sometimes(I still hold it though).Thanks!