Brickell is a great area to live in, but depends what it is you are looking for. Do you see yourself living in a condominium with your kid? Brickell is mainly composed of buildings so if that is what you are looking for then it would be a good match. Buildings in that area usually have a wide array of amenities which I'm sure you and your kid would love. However, if you are looking for a spacious house and a big yard then I would advice to look at different areas.
Hope this helps. Feel free to contact me should you have any questions.