Bottle feed with expressed milk or with formula?
At first I would solely breastfeed as that builds up your supply. Babies are better at getting milk out than any expresser.Personally I wouldn't introduce formula as that interferes with your milk supply. It's best to try and exclusively feed off of the breast for the first 6 weeks. I got mastitis several times and couldn't bear to feed as I felt too ill to even hold Ella, although that would have been best to help clear it, instead I expressed. I also gave Ella a handful of formula top ups when wrongly advised by my HV. I believe that the recurrent mastitis and the top-ups stopped my supply from adjusting as it should. Ella is mostly breastfed but has one bottle of expressed milk before bedtime.