You’ve given birth, YAY and Congratulations! The fourth trimester is a period of transition considered to be from when you give birth until three months postpartum. Whether you are a first-time mom navigating what it means to care for your infant, or a mom of multiples navigating the world of introducing a new family member to the mix there has been a shift in your family dynamic. This is also a transition time for your body. It is doing a LOT of healing at this point during the fourth trimester.