I bought a 4 pack of medela bottles and they came with the orthodontic (sp?)nipples. My baby won't suck on an artificial nipple, but we tried these today and daycare said they were great because the flow was faster and Kayla could get the milk out by playing with the nipple (she won't suck). I assumed that they would be good for a breastfed baby, but I am concerned that if the flow is too fast, she will get frustrated breastfeeding if MY flow is slower. What do you all think? Have you used these nipple? She took 4 oz today (dripping in her mouth)...the most so far!