If you are a child or teenager and dream that you are an adult, then it implies that you need to be more mature about some situation. Perhaps you have some growing up that you need to do. Alternatively, the dream may be reinforcing your sense of responsibility.
To dream of diapers represents something in your life that has to be looked after all the time. A very demanding problem or something that requires constant responsibility. Closely monitoring a problem or responsibly taking precautions to avoid embarrassment that is prone to happening. Preventing a problem from being worse than it needs to be. Childish behavior.
To dream of changing a diaper represents your efforts to look after or manage a problem. A person or area of your life that requires constant attention. Managing an area of your life that is prone to making a mess of things. Keeping something risky or dangerous under control. Alternatively, it may reflect your feelings about cleaning up after someone else's childish behavior.
To dream of a soiled diaper represents awareness of a problem in waking life that needs attention. A need to responsibly or discreetly take care of something. A need to attend to someone else's problem.
To dream of a diaper spilling out or coming off and making a mess may represent responsibilities that you failed to be attentive enough for. Feeling that you or someone else was not careful enough. Embarrassment that you didn't watch something risky close enough.
To dream of wearing a diaper represents feelings about yourself requiring being looked after regularly. Negatively, it may reflect feelings of being helpless to do anything except be taken care of. Feeling childish, embarrassed, or impotent that you need to be taken care of. Alternatively, wearing a diaper may reflect mommy issues.
Example: A woman dreamed of seeing a baby in a diaper leading her by the wrist in a dark room. In waking life she was having second thoughts about a fertility procedure at a clinic. The diapered baby reflected her desire to raise a child.