What age should the bottle be taken away?

she will let you know when she is ready there is not a specific or right age some are a little slower at getting use to cups then others let her tell you when the right time is in the mean time i would try getting cups as close as possible to the bottle an with the right flow witch she preferes i found with my first born she took to a cup very quickly then my second one just slowly encourage her with one that she likes you might need to try a different kind other then the one your trying with