Hi I am a new member I have a five yr old girl with PKU. I had a lot of trouble getting her of the bottle, I left her alone and she decided she was to old her for the bottle, it was for babies she said and she was embarrassed to take it with her. She was almost 4 before she gave it up. she is using a sippy cup or a sports cup now. There are days when we do have a struggle drinking it. I have tried adding to it to flavour but it doesn’t work.