Like most birds budgies change noticeably as they mature and go through their first molt. Especially is this the case with English budgies, who have longer feathers and more pronounced features.
Depending on the mutation the specific color can change quite a lot too. For example color adding factors like violet can become much more deep or bright in color. Single factor yellowface II and single factor goldenface budgies especially change color drasticly, with the yellow spreading all over the body.
Here are some examples of before and after the first molt in some of our budgies!
Farran is a normal grey.
Farran before his first molt
Farran after his first molt
Gemma is a cobalt double factor violet opaline.
Gemma before her first molt
Gemma after her first molt
Tacori is a blue series opaline lacewing.
Before her first molt
After her first molt
Nila is a cobalt double factor violet opaline recessive pied.
Nila before her first molt
Nila after her first molt
Rylan is a normal grey.
Rylan before his first molt
Rylan after his first molt
Pierson is a cobalt blue double factor violet normal.
Pierson before his first molt
Pierson after his first molt
Cypress is a grey opaline cinnamon.
Cypress before her first molt
Cypress after her first molt
Kilani is a opaline blue series lacewing.
Kilani before her first molt
Kilani after her first molt
Saxon is a sky blue double factor violet single factor spangle.