When we examine the ols results for all women together and do not differentiate between the informal and formal sectors, we find a motherhood wage penalty that increases with the number of children (3.8% for one child, 9.6% for two children and 19.4% for three or more children). As predicted, the estimated coefficients associated with motherhood and children are not significant in the formal sector. In other words, the hypothesis that there would not be a motherhood wage penalty in the formal sector is consistent with the empirical evidence.