DS is nearly 3 and potty trained. He sometimes gets what look like mini-erections and seems to find it really uncomfortable anc complains about it. He seems almost scared by it. I just tell him not to worry and it will go away soon, and distract him. This usually works but when it doesn't he ends up shousting "I've got a BIG WILLY!!! WILLY's BIG!!!" at the top of his voice in public.
Any advice?!