When your bird has reached adult size, you may have to buy a new cage, unless you consider the size of your bird at an adult age when you purchased the cage. The bird will need to have plenty of space when they are in the home.
They will need to stretch those wings out and walk around. Many choose to go with an indoor bird aviary, instead of getting the traditional, small cages. You should take note that the bird is not meant to be in a prison, so you need to make a good home and environment for this pet. It is important to look at the design of it before you get it.