How soon after you have a baby does your immune system return to normal?

3-4 months: Depending on the type of birth (Vag vs Csection) a woman's immune system will typically go back to normal after 3-4 months. Some inflammatory problems following childbirth such as infection, excess bleeding and autoimmune reactions can cause variations from this. If you are experiencing an increased number of infections or have symptoms such as rash, joint pain, headaches or body aches, see a DR.