I have tried giving DD a bottle/cup of formula for four days now, and she will not have a bar of it. Throws the bottle or spits it out. I am trying her on NAN B2. My son didn't have this problem (although much younger, he took to the formula and bottle straight away). DD has used a bottle for water and knows how to suck etc, but just refuses to drink it and then screams until I BF her. What can I do? Should I try using a different brand formula, or will that not make much of a difference? She is 8.5 months, or is it even easier going from BF to cows milk at 11 months?