This research discussed the effects of maternal employment on child cognitive development using the IFLS’s data on children aged between 7-10 years old. The results indicated the negative effects of maternal employment when children were between 0-3 years old. Yet, maternal employment on children aged between 7-10 years old was positively associated with children’s cognition. The accumulated additional hours of the working mother when children were older than 3 years also affected the children’s cognition positively. Furthermore, this development was also affected by other factors, such as the child’s inputs, the mother’s inputs, and the family’s inputs.