Any plans for pregnancy must be discussed in detail with women with bipolar disorders. They must be informed about the risks related to it and the need for some precautions. Because of the risk of relapse during pregnancy, the risk/benefit ratio of maintaining or starting prophylactic treatment should be assessed, taking into account family history and frequency of recurrences. Lithium may be used during pregnancy under close monitoring. Most anticonvulsants are contraindicated because of their teratogenicity. During the post-partum period, prophylaxis is required in most cases because of the high risk of relapse. If no prophylaxis was given during pregnancy, it must be started quickly after delivery to be effective when the risk is at its highest, i.e., during the first two weeks after delivery. Women with bipolar disorders should be advised against breast-feeding to avoid exposure of the infant to psychotropic medication. Because breast-feeding can be stressful and causes sleep deprivation, it may increase the risk of relapse. Second-generation antipsychotic agents should not be used during pregnancy or breast-feeding because inadequate information is currently available about their safety.