Data from child language comprehension show that children make errors in interpreting pronouns as late as age 6;6 yet correctly comprehend reflexives from the age of 3;0. On the other hand, data from child language production show that children correctly produce both pronouns and reflexives from the age of 2 or 3. Current explanations of this asymmetric delay in comprehension either have rejected the comprehension data outright or have argued that the problems are pragmatic or caused by processing limitations. In contrast, our account, formulated in the framework of Optimality Theory, handles the comprehension data as well as the production data by arguing that children acquire the ability to take into account the alternatives available to their conversational partner relatively late. It is this type of bidirectional optimization, we argue, that is necessary for correctly interpreting pronouns.