yeah that goes for the whole onion/leek family, broccoli, cauliflower, cabbage family, brussels. But the way it was put to me was that the wind would only be painful/annoying for a gut that is supersensitive, or immature, i.e 6-8 months, so as they get older is would create wind but easily dealt with.
I am thinking Ollys wind is a part of something a bit more than just sulphur, don't you?