We estimate the short- and long-run labor market impacts of parenthood in a developing country, Chile, based on an eventstudy approach around the birth of the first child. We assess mechanisms behind these effects based on a model economy and find that: (i) informal jobs’ flexible working hours prevent some women from leaving the labor market upon motherhood, (ii) improving the quality of social protection of formal jobs tempers this increase in informality. Our results suggest that mothers find in informal jobs the flexibility needed for family-work balance, although it comes at the cost of deteriorating their labor market prospects.