The flow would depend on teat. I use philips avent with spectra ppsu bottles. Can find both on shopee https://shopee.sg/product/242594539/5732034154?smtt=0.0.9
Use suitable teat. Milk flow too slow may cause gassy problem for nb
Philips Avent, with the 0m+ teat
Como tomo
Pigeon they had ss teats
Pigeon & Dr brown
Pigeon is fine..
Tommee Tippee
Dr. Brown
Dr. Brown