If you think someone is concealing any information from you, that you deem important, ask about it. If you are not satisfied with the answer and won’t get a more satisfactory answer, move on. The question posed here, is should you volunteer information, if not asked about it. I asked about one of these “deal breaker” type qualities and was told that if I knew for certain this is something (in this case) the girl calls a deal breaker, I must tell her even if she doesn’t ask about it, the reason I was given is that, since it is known they consider it a deal breaker, they don’t even ask about it, the Rav continued, has anyone ever asked if the prospective shidduch is shomer shabbos, it is assumed one would not suggest a mechallel shabbos so they don’t ask, same is true in the situation I asked about.
To mr spleen. In your situation, if I ever suggest a shidduch to you, I will be sure to foward certified copies of a birth certificate and most recent physical that includes height and weight, and of course a full frontal photo so you can be assured she isn’t fat or younger than stated.