i am try to get rid of 奶嘴 starting from my son 10 months old...of course, it is not easy at the beginning. He doesn't cry when he sleep w/o 奶嘴, but it takes long time for him to fall a sleep, that's mean it trained up our patient at all...just a few day, he can totally forget the 奶嘴.
Now, I am just thinking when to start drinking milk w/o bottle, it is much difficult for the milk time at night.