LO is on about 4oz which isn't a lot in comparison to other babies of her age. Sometimes she will drink this fine, but other times like now, she's done 3hour between feeds and was crying for milk, she drinks the first 30mls then goes really slow. If I sit for ages I might get her to drink 60mls or 90mls but it's a long process. She cries when I take the bottle out, when I put it back in she chugs a few mouthfuls then stops again. Any ideas to get her to eat more and faster?