For two budgies a cage 40 X 20 X 32 inches is considered the minimum. If your birds do not get a lot of time outside of their cage then a larger cage is recommended. Keep in mind that bigger is always better for your birds.
It's best to get the largest size cage you can afford that fits in your space. Parakeets should have several perches and room to fly from one perch to another.
A clean and wide single cage with enough supply of bird seed and water with vitamins is okay for two baby parakeets.Their size is not big to put them in a double cage.
