I was just talking to somebody from my mortgage company on the phone, and we somehow got to talking about kids, and she told me a friend of hers delivered triplets at 21 weeks, and they're now several weeks old and the docs are saying they're going to make it.
Could this possibly be true? 21 weeks? 
Re: viability @ 21 weeks?
I supposed anything is "technically" possible. The youngest babies that I have heard truly surviving are 22 weeks. And that is few and far between.
My guess is either the person you were talking to was incorrect about age or the gestational age of the babies was incorrect (meaning althought they though they were 21 weeks they are really 24 or 24). Did she say how much they weighed?
My neighbor had her son at 34 weeks because they did an ultrasound and freaked out that a 38 weeker was only 4 pounds. They thought he was in distress so they did the c-section when they didn't need to. Oops.
She said they were just over a pound each. That's pretty huge for 21 weeks, isn't it?
Whatever is going on in that NICU, I hope those 3 tiny babies keep on fighting. Freaking prematurity
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I'm guessing they had her dated wrong. DD was only 12 oz at the 20 week anatomy scan and she consistently measured 2 weeks ahead.
Our hospital told us this even if we delivered at 24w (they thought we were going to), but luckily we made it to 26w!
ditto. My daughter was born at 23.5 and only weighed 15oz. But her weight wasn't her issue, it was her lungs. They were pretty big for being multiples and only being 21 weeks. I guess anything is possible?