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It's possible that if you're scanned before 12 weeks, you'll see two foetal heartbeats and two foetal sacs, but one will have disappeared by the 12-week scan. This is because one of the embryos failed to thrive and it has been reabsorbed into the womb. This is referred to as vanishing twin syndrome and has no physical effect on the surviving baby.
--[[User:Mad Margaret|Mad Margaret]] ([[User talk:Mad Margaret|talk]]) [[File:Mad Margaret.jpg|64px|link=User:Mad Margaret|Mad Margaret]] 18:13, 10 May 2013 (UTC)
