Hi all. Our twin girls came at 36 weeks and are now 37 weeks old. They seem keen to bottle feed but we are having issues with finding the right bottles. They seem to take an hour to drink 50ml from the Dr Brown premmie bottles (or tire themselves up and give up before), and with the MAM premmie bottles they guzzle them in ten minutes and almost choke on every feed. Anyone use any other bottles which are somewhere in the middle ? Thank you