If you are single and have never thought about getting pregnant or having a boy, the dream child generally represents other things in real life, such as what you have created, your plan, what you have worked hard to get, and so on.
Not having children may reflect the difficulty of realizing a plan or creating something.
You gave birth to a meatball, which may reflect that the planned result is not what you think.
Suddenly falling into the pool and disappearing: reflecting the process of handling plans or overcoming difficulties, disappearing, implying no result.
Generally speaking, your experience is the key to dream interpretation. Many times, the dream of having children is also related to a new beginning and psychological growth. Good luck!