Answer:
Children keep their assets in this.
One time every year, there is a very special day. Little have the same, everyone party a different way.
This royal young lady had several short men following her and helping her in the forest!
When we stand up it lies flat. When we lie back it stands up.
Shorter than my four siblings, but easily the strongest, Sometimes I wear a funny hat.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?