Hi Syslam,
哎呀! My son & your bb are the same! My son only drinks 3 - 4 oz per meal. I finally find someone in the same situation!! But his size is OK. So I am not too worried. Except we have more work to do. His feeding is also very 漂浮. Create a lot of waste in milk.
I tried not to feed her for more than 7 hours and hoping that she will beg for milk. Unluckily, she didn't. When I tried to feed her after 10hours, she cried and pushed the milk bottle away.....I was really scared that she would be too hungry....as the situation took too long so I finally giveup and use medicine to make her "open stomach" given by her doctor.