Hi
When my daughter was 11 months I was told I could drop one of her breast feeds and replace it with cows milk as long as it had been completly boiled 30 mins before giving it to her. My daughter also and even now at alomost 14 months want drink milk out of a cup so she has 1 cows milk drink at her lunch time nap in a bottle and 2 breast feeds along with cheese, yoghurts and custard every day and milk on her ceral. Aslong as she is getting the equivelent of a pint of milk a day she will be ok with only 1 breast and 1 formula a day. You might have a but one of every style of cup their is you can get until you find a cup she will drink from. I have tried advent, timmee toppee, little wonder, boots, superdrug, tescos, morrison, asda, aldas and mothercares style of cups and now she has 2 cups and 4 different styles of sports bottles that she will use.