The limit of viability is the gestational age at which a prematurely born fetus/infant has a 50% chance of long-term survival outside its mother's womb. With the support of neonatal intensive care units, the limit of viability in the developed world has declined since 50 years ago, but has remained unchanged in the last 12 years.[16][17] Currently the limit of viability is considered to be around 24 weeks although the incidence of major disabilities remains high at this point.[18][19] Neo-natologists generally would not provide intensive care at 23 weeks, but would from 26 weeks.[20][21][22]