Daemon Forms
From Daemon Wiki
Throughout your childhood, your daemon's form is relatively superficial. It's just whatever is appropriate at the moment, whatever is fun. As you grow up, your daemon settles into one form that most closely represents your personality, which is the settled form. Sometimes there is a period in which your daemon sticks with one form for long periods of time while not being truly settled, changing its form once more.
Changelings
Some daemons will never seem to settle. This is not necessarily a lack of maturity or presence of a disorder, it is just a sign of an ever-changing personality.