hi my ds is 11wks old and i'm starting him on f...

hi my ds is 11wks old and i'm starting him on formula as having probs with my milk supply. any advise on how best to go about this would be great. should i slowly wean off breast and gradually intro bottle feeds or just straight out bottle. at moment am bf him and using bottle to do topups except for his 10pm feed which is solely bottle( the 10pm feed has only been started this week as paed adv due to no weight gain in 3wks). in the end im looking to just be bottlefeeding which is such a depressing disapointment as i quiet enjoy them.. any advice would be appreciated thanks.