To dream that you are a small child again suggests that you are feeling the burdens of adulthood. You are trying to escape from your daily responsibility and are looking for someone else to shield, protect and care for you.
To dream that you lose a child represents losing hope. It may also suggest that a project is not working out as you had wanted it to.
To save a child in your dream signifies your attempts to save a part of yourself from being destroyed. If you dream that you are separated from your children, then it symbolises failure in some personal endeavor or a setback in some ideal you had.
To see a child fall down in your dream denotes lost innocence.