Postpartum hormones usually last for approximately 2 weeks after the baby is born. Postpartum hormones are what commonly impact the development of the baby blues. In some cases postpartum hormones regulate within 2 weeks of delivery. However, there are times such as when breastfeeding, where postpartum hormones can fluctuate. Hormone levels are very individualized to each woman, and therefore it is hard to set a normalized timeframe. It is important to note that if you are concerned about your specific hormone levels to consult your family physician. .