This is just soooo overexaggertaed I don't get it?! I believe they could have been concieved seperately, I have heard of it, but to say they aren't twins, that it could be disaster if she went into labour early, and making out the developmental differences would be huge is so irritating....there's TWO weeks between them??!! To describe them as different ages is plain stupid. You've got twins love, and unusual ultrasound and story to tell the grandkids, great good for you- now appreciate your TWINS of the SAME age and get over it!!!!!! It's like me saying I am soooooo much older and mroe developed than my husband because I am 12 days older....
Now what would be an interesting story is if they had different dads! Now that would be a good read!!!!