While you are breast-feeding, there can be no menses for 4-6-8 months depending on your body physiology and amount of lactation. Periods return on their own, once the breast milk is reduced or weaned off. This is called Lactational amenorrhoea and does not need treatment. It has the added benefit of providing some contraception - till the milk is fed - it is not 100% effective and after 6 months another contraceptive needs to be added if no other baby is desired soon. These can be anything from the following - IUCD / oral pills / condoms / inj DMPA - suitable to your lifestyle and budget.