While reactions to the OP are understandable, I think you've scared him off big time, but if he's still reading I just want to say it's his and his wife's decision alone. Rightly or wrongly, a lot of people do rehome a dog because they haven't thought it through to a child coming along. All I can do is reiterate what people have said about rehoming through a reputable rescue if you think rehoming is the way to go. In my experience, a cocker would not be waiting long for a new home - a matter of a few days usually, and usually they generate a lot of interest and you can pick the best home going for them, but you need to be totally honest about any issues your dog may have to get him a home with the right experience. You don't say where you are but if you're in Scotland, please PM me if you wish. I'd like to help.
I've no idea what he means by "sell to the farm" so I cannot even comment, let alone pass judgment.