Hi Cor,
First of all I hope I can make myself clear as my English is not great but I will make an effort. I know what you are you talking about. I just had the same situation with my baby (she is 4 months old), I needed her to take the bottle as I wasn't producing enough milk, I tried everything and nothing worked. I tried once to stop breastfeeding completely and wait until she was hungry enough so she could take the bottle and after 16 hours I was very concerned about her health so I breastfed her. I tried again the following weekend and the same happened. The third time I went to the pediatrician to make sure I did not put on risk her health, so he recommended me to continue with the solids as normal (breakfast and lunch) and to give her 3 ml of Pedialyte every hour with a syringe. So I did that and after 28 hrs, she was not taking the bottle so my husband tried to give her some apple juice ( specially for babies - Gerber) in another bottle and she took it right away! after 5 seconds he switched the bottle and gave her the one with the milk and she took it as well and drank 5 Oz the first time, the 2nd, 3rd, 4th time, we had to use the juice trick before the milk and from the 5th she took the bottle perfectly with out juice. Now she is taking the bottle and I am very happy that I can keep record of how much milk she is taking and very important!! she is sleeping throughout the night

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We used the juice as our last resort but probably it can work from the beginning. Also, for the record I gave her the juice in one bottle (Avent) and the milk in another bottle (Dr. Brown) and she did not have any problem, so at least in her case the nipple shape was not the problem!
Well this is what it worked for us, I hope it works for you too, let me know and good luck!
