I think I did it round about 7.5/8 months
and he recently started playing with his 2nd and 3rd bottles so I am experimenting with just a morning and bedtime bottle + a 'snack - bottle' in his straw or sippy cup in the afternoon, so he gets used to feeding himself - some days he takes it others not.
I don't stress anymore because the recommended amount of milk is 20oz / 600 ml a day (about a pint) - and that includes milk from other sources such as custards and yoghurt.
Calum never goes below 20oz of milk alone, he also eats a yogurt per day and lots of cheese and dairy products, etc.......