I basically agree with everyone on the 22/23 weeks being the cut off due to lung development and anyone out there who claims to have a sub 23 weeker, I'd bet my liscence there are dating issues. My issue is with the term viable, I think when we tell parents antenatally that 23 weeks is the point of "viability" they misinterpret that as meaning "my baby will be ok" Vialbility is a really grey word.... I've seen a number of 23+ weeks infants survive, but none that I can say are truely "normal" in terms of physical, intellectual, sensory, markers, Some will be functioning adults but have disabilities. I have seen many 25 weekers do very well however. I feel that 25 seems to be the point at which at truely well child can result. Our unit standardly wont attend deliveries under 24 weeks/500g which is higher than the unit I previously worked on, the cut off there was 23+0 and 450g. Cheers All