JAMA - Antenatal MgSo4 in Preterm

"School-age Outcomes of Very Preterm Infants After Antenatal Treatment With Magnesium Sulfate vs Placebo"

"Conclusions and Relevance  Magnesium sulfate given to pregnant women at imminent risk of birth before 30 weeks’ gestation was not associated with neurological, cognitive, behavioral, growth, or functional outcomes in their children at school age, although a mortality advantage cannot be excluded. The lack of long-term benefit requires confirmation in additional studies."  
http://jama.jamanetwork.com/article.aspx?articleid=1904828