When a child takes decisions related to his career, so, he is somewhere between the age group of 15-18. A child who falls under this age group qualifies to be mature enough to make his decisions on his own. There should be freedom of choice. If he chooses his field of interest, he surely excels in his field and make success and become proficient. If you impose your decision on him, either he will not be able to progress in his field or become hostile to you. As a result, he may fail to be a successful man further. But, if he is bewildered regarding his career, you can act as a counsellor or mentor for him, which may help him to choose the best field for him.