(NEWSER) – Just 23 weeks into Holli Gorveatt's pregnancy, she gave birth to Link, who weighed in at 1 pound 2 ounces and, right on the edge of viability, stands a 10% chance of normal development.

Just as astounding is that Link has an identical twin brother Logan who remains in utero and is growing normally. The unusual situation, which has left Gorveatt both pre- and post-partum at the same time, is the result of twin to twin syndrome, in which the developing fetuses share a placenta and one draws blood from the other, leaving one "bloated" and the other "weak," reports People. The syndrome is fatal 90% of the time, Martin Walker, their doctor and the director of fetal medicine at Evergreen Health Medical Center in Kirkland, Wash., tells ABC News.

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