I have 4 day old baby. Cannot breastfeed due to totally flat nipples - really tried but baby not taking it at all. Midwife suggested trying Avent nipple protectors as a last resort and they work (although baby may get addicted to them and never truly breast feed.) Unfortunately my nipples are getting grazed or rubbed somehow near the top so midwife suggested getting a larger size. Avent don't do a larger size. Any suggestions or is there another brand I can try?