小兒好勝 (要第一), 敏感 (如覺得人地笑佢, 反應會大), 容易唔開心 (驚壞事發生) => I suggest you to handle this problem properly, but not to avoid it. Nobody is number one in the world and it is better to let him now earlier. Let him face this reality and failure.
It is not easy and I am still learning everyday. Explain to him that everyone has strength and weakness. Tell him what dad & mom are good & bad at. Appreciate his effort spent when achieving something but not just say that he is smart.