How old is ur baby? Cos if already like 6mth+ actually can transition to open cup or straw cup liao, not too early! My lo also went thru this phase, what worked for us was the Munchkin 360 cup, very easy for them to figure out. Can also try Pigeon straw cup. If baby can already drink slowly from straw just keep at it and slowly increase the amount, dun stress too much abt the bottle. As long as still getting enough milk via other means should be ok 😊