The rate of infants being born prematurely has shown anunexplained increase. The survival rate of these preterminfants:  

has plateaued since the 1970s, despite the use of intensivemedical interventions.  

has decreased, with more of them not surviving past 1 month ofage.

has greatly increased, even for those weighing less than 2pounds.  

has remained the same, with infants weighing less than 2 poundshaving the most stable rate of survival.  

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