We investigate the effects on health at birth of a shock generated by a major (25%) and unexpected wage cut austerity measure that affected all public sector employees in Romania in 2010. Our findings suggest an overall improvement in health at birth for boys exposed to the shock in early gestation and a decreased sex ratio at birth among early exposed children. These findings are consistent with the selection in utero theory hypothesizing that maternal exposure to a significant shock early in gestation preponderantly selects against frail male fetuses, with healthier survivors being carried to term.