I've finally found a cup that my 7 month old can use (Avent magic cup) after buying every cup under the sun. He drinks water very well out of it, and I'm trying to get him to use it for milk. Avent suggest that mixing feeds in their cups is inadvisable as it might clog the valve. I've strted using ready made milk because of this, but this is more expensive and now I've got something else to buy. Has anyone got any advice on this?