Reflux and pain when opening bowels?

Jessica

My baby was born on the 26th of October at 37 weeks and weighing 3’12. I am expressing and feeding by bottle at the moment but my baby has had abit of reflux and seems to be in pain when opening his bowels, should I give up breast feeding and switch to sma pro prem or keep breast feeding? Need advice ASAP sick of seeing my little boy in pain and discomfort