1. Every child has his own likes and dislikes, but when he starts complaining, it is not good for his mental health, because his friends will leave him and this habit will remain in future also.
2. In such a situation, it is important that you listen to him properly, keep eye-to-eye contact with him, tell that you have listened to him, and then explain that this behavior is not right.
3. If possible, record this habit of his and his talking style in mobile, show him and explain that improvements have to be made in the way of getting his point across.
4. If the child complains a lot about something, then teach him how to solve that problem, so that he will be prepared for future difficult situations, and also understand that complaining on everything is not the solution to any problem.
5. Your response to every complaint of the child matters a lot, so the more you will speak to him lovingly and without annoyance, the more deeply it will influence the child.
6. If the child is being negative about everything, then it is your responsibility to change his attitude, so teach him to be grateful and happy about his own things, instead of complaining about something that he does not have.
7. Before reacting to any habit of the child, it is necessary to ascertain if you also have the habit of complaining, because children learn the most from habits of their elders, and so it is important to change your behavior too.