Why Oestrogen Levels Differ for Mothers Who Breastfeed vs. Those Who Don’tYour hormones go through the second round of adjustment after childbirth. But the oestrogen levels depend on whether you breastfeed or not. Why does it matter? Well, hormones work with each other to create a balance. Understanding the changes can help you take care of your physical and emotional health during the postpartum period. You will also learn tips to manage the symptoms that may come with it.