You can use 2-3 layers of rubber breast pads which would probably be the most comfortable option, but you should consult with your son first on whether he actually wants the appearance of breasts.
Quote:To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.
- Lau Tzu
Join me on atheistforums Slack (pester tibs via pm if you need invite)