Sure, that's easy. Is everybody saved? Or does election to salvation mean mere salvability? If you are elected to salvation, can you fail to be saved? If every infant is elected unto salvation, why isn't every single one of us saved? Also, I'm not a WCF follower.
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I do believe that all elect infants and only elect infants go to heaven based on Christ's substitutionary death for the elect. Although I tend to believe that not all infants are elect, I have not decided it conclusively in my mind (and may never come to a absolute conclusion).
Precisely. Only the elect go to heaven. Not everybody goes to heaven. Not everybody is elect. It's that simple.